[WININET] Avoid crash

[Sven Paschukat]

Native shlwapi.dll calls GetUrlCacheEntryInfoExW in wininet.dll with 
params 2 - 6 set to null. This undocumented parameter setting later 
results to a crash in URLCache_CopyEntry. Following code fixed it.

ChangeLog:
Avoid crash in URLCache_CopyEntry
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Index: dlls/wininet/urlcache.c
===================================================================
RCS file: /home/wine/wine/dlls/wininet/urlcache.c,v
retrieving revision 1.24
diff -u -p -r1.24 urlcache.c
--- dlls/wininet/urlcache.c	8 Feb 2005 13:43:09 -0000	1.24
+++ dlls/wininet/urlcache.c	15 Mar 2005 21:43:05 -0000
@@ -1245,6 +1245,13 @@ BOOL WINAPI GetUrlCacheEntryInfoW(LPCWST
         return FALSE;
     }
 
+    /* There are undocumented calls with this params set to NULL */
+    if (lpCacheEntryInfo == NULL && lpdwCacheEntryInfoBufferSize == NULL)
+    {
+        URLCacheContainer_UnlockIndex(pContainer, pHeader);
+        return TRUE;
+    }
+
     pUrlEntry = (URL_CACHEFILE_ENTRY *)pEntry;
     TRACE("Found URL: %s\n", debugstr_a(pUrlEntry->szSourceUrlName));
     TRACE("Header info: %s\n", debugstr_a((LPSTR)pUrlEntry + pUrlEntry->dwOffsetHeaderInfo));