[QUARTZ] Small video renderer fix

[Christian Costa]

Hi,

Changelog:
Release clock only when one is set.

Christian Costa   titan.costa at wanadoo.fr

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Index: dlls/quartz/videorenderer.c
===================================================================
RCS file: /home/wine/wine/dlls/quartz/videorenderer.c,v
retrieving revision 1.8
diff -u -r1.8 videorenderer.c
--- dlls/quartz/videorenderer.c	28 Mar 2005 14:17:51 -0000	1.8
+++ dlls/quartz/videorenderer.c	3 Jun 2005 20:52:20 -0000
@@ -422,7 +422,9 @@
     if (!refCount)
     {
         DeleteCriticalSection(&This->csFilter);
-        IReferenceClock_Release(This->pClock);
+
+        if (This->pClock)
+            IReferenceClock_Release(This->pClock);
         
         IPin_Release(This->ppPins[0]);