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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<tr><td><span title='2020-10-01 15:47:29 +0200'>2020-10-01</span></td><td><a href='/guix/commit/gnu/tests/virtualization.scm?id=18e76f89055f25f015fadb7c999b410f38a88cc6'>services: hurd-vm: Resurrect system-test by using raw disk-image.</a><span class='msg-avail'>...</span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-09-29 21:56:28 +0200'>2020-09-29</span></td><td><a href='/guix/commit/gnu/tests/virtualization.scm?id=c11c19bd4d0dc4ec56b949647057dbf00567f2ae'>services: hurd-vm: Add system test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>