fix crash in mciwnd.c

[mehmet yasar]

Changelog:
	fix crash in mciwnd.c


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diff -ur CVS/wine/dlls/msvideo/mciwnd.c wine/winecvs/dlls/msvideo/mciwnd.c
--- CVS/wine/dlls/msvideo/mciwnd.c	Sun Mar 10 13:36:09 2002
+++ wine/winecvs/dlls/msvideo/mciwnd.c	Tue Mar 26 16:38:02 2002
@@ -83,6 +83,7 @@
    MCIWndInfo*	mwi;
    
    TRACE("%x %x %lx %s\n", hwndParent, hInstance, dwStyle, szFile);
+   if (!szFile) return 0;
 
    MCIWndRegisterClass(hInstance);