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='2014-11-28 15:08:56 +0100'>2014-11-28</span></td><td><a href='/guix/commit/gnu/build/linux-modules.scm?id=7c4885f0d79593cb0f3a7981444f611d7ced54b9'>linux-modules: Correctly propagate error code from 'init_module'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/guile-linux-syscalls.patch (scm_load_linux_module):
  Leave 'errno' unchanged when ERR != 0.
* gnu/build/linux-modules.scm (load-linux-module*): Check for the errno
  value of ARGS to determine whether the module was already loaded.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-11-28 00:10:28 +0100'>2014-11-28</span></td><td><a href='/guix/commit/gnu/build/linux-modules.scm?id=fcaa5f44a197ab24f288d319dbdd27e2745bb052'>system: Add (gnu build linux-modules).</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/linux-modules.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>