os: Initialize NotifyFds earlier in startup

If the server calls AbortServer during the first-time initialization
(which can happen if you start the server on an already using
DISPLAY), then the dbus code will shut down and call the notify fd
interface. If the notify fd list hasn't been initialized, the server
will crash.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

os/osinit.c

@@ -195,6 +195,7 @@ OsInit(void)
 #ifdef BUSFAULT
         busfault_init();
 #endif
+        InitNotifyFds();
 
 #ifdef HAVE_BACKTRACE
         /*
@@ -314,7 +315,6 @@ OsInit(void)
         LockServer();
         been_here = TRUE;
     }
-    InitNotifyFds();
     TimerInit();
     OsVendorInit();
     OsResetSignals();