Exit after the user's session has finished.  This works around slim's broken
PAM session handling (see
http://developer.berlios.de/bugs/?func=detailbug&bug_id=19102&group_id=2663).

Patch by Eelco Dolstra, from Nixpkgs.

--- slim-1.3.6/app.cpp	2013-10-15 11:02:55.629263422 +0200
+++ slim-1.3.6/app.cpp	2013-10-15 13:00:10.141210784 +0200
@@ -816,7 +822,7 @@
 	StopServer();
 	RemoveLock();
 	while (waitpid(-1, NULL, WNOHANG) > 0); /* Collects all dead childrens */
-	Run();
+	exit(OK_EXIT);
 }
 
 void App::KillAllClients(Bool top) {
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<div class='path'>path: <a href='/guix/log/?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>root</a>/<a href='/guix/log/gnu?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>gnu</a>/<a href='/guix/log/gnu/services?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>services</a>/<a href='/guix/log/gnu/services/cups.scm?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac'>cups.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/cups.scm?id=0f89d91411f68fbac0e020fbfe92a6bf880065ac&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-05 19:17:41 +0100'>2021-12-05</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=9bc0f45df5d6aed217020b1183dca54989844fb0'>Merge remote-tracking branch 'origin/master' into core-updates-frozen</a></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2021-11-30 01:08:55 +0100'>2021-11-30</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=892f1b7273d57b25940700877a02618fe826cc08'>services: Accept &lt;inferior-package&gt;s in lieu of &lt;package&gt;s.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-11-17 23:43:14 +0100'>2021-11-17</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=3a317f7476f8c6012e166ff9f340f861938721c9'>Merge branch 'master' into core-updates-frozen</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-11-16 01:15:04 +0100'>2021-11-16</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=122396075f12b013b6bde56dafb895587b95bc9d'>services: cups: Update default timeouts.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-06-23 18:45:21 +0200'>2021-06-23</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=9dea3f101f252331c049c03f501398a5ec837ba9'>Merge branch 'master' into core-updates</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-06-23 03:26:33 +0200'>2021-06-23</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=828ceee7db0ab74786049600108d6b15017851c5'>services: cups: Remove obsolete KeepAliveTimeout directive.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-06-23 03:01:48 +0200'>2021-06-23</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=e254287b0c22fc89566bd08207dc72f4f8c9972d'>services: cups: Fix ‘files-config’ typo/left-over.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-06-23 02:51:30 +0200'>2021-06-23</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=c655bbb376d2dd73805cef344c496f6f77b22d0f'>services: cups: Support CUPS 2.3.3op2's LogFileGroup directive.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-03-10 18:01:47 +0100'>2021-03-10</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=520bac7ed00a949a0391ad680de65a1498105c2b'>services: Prevent following symlinks during activation.</a><span class='msg-avail'>...</span></td><td>Maxime Devos</td></tr>
<tr><td><span title='2021-01-17 20:16:05 +0100'>2021-01-17</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=476b333fbcda397557382a0988646b8bd177874d'>services: cups: reuse lp from %base-groups.</a><span class='msg-avail'>...</span></td><td>Leo Prikler</td></tr>
<tr><td><span title='2021-01-10 23:38:49 +0100'>2021-01-10</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=2a4fdb41941ffcc5611a8d6df3ea04a29561aa80'>services: cups: Add brlaser extension by default.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-21 23:00:06 +0100'>2020-11-21</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=13180f6accf815253107420d264e0c82ad064608'>services: cups: Add Splix by default.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-21 22:59:47 +0100'>2020-11-21</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=0b57c1b09efb74f0b30fd74c7c1eb2da1f5957bc'>gnu: Rename escpr to epson-inkjet-printer-escpr.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-18 10:00:11 +0100'>2020-11-18</span></td><td><a href='/guix/commit/gnu/services/cups.scm?id=8490fa0253fa8ee5613a89851273e007494ea79b'>services: cups: Add some extensions by default.</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>