os: drop OsCleanup()

Since we're always terminating now, everbody can call UnlockServer()
directly, so we don't need that extra function anymore.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

dix/main.c

@@ -103,6 +103,7 @@ Equipment Corporation.
 #include "os/ddx_priv.h"
 #include "os/osdep.h"
 #include "os/screensaver.h"
+#include "os/serverlock.h"
 #include "Xext/panoramiXsrv.h"
 
 #include "scrnintstr.h"
@@ -350,7 +351,7 @@ dix_main(int argc, char *argv[], char *envp[])
         ClearWorkQueue();
 
         CloseWellKnownConnections();
-        OsCleanup(TRUE);
+        UnlockServer();
 
         ddxGiveUp(EXIT_NO_ERROR);