winemenubuilder: EnumResourceNamesW() returns false when we find the icon. So fix the corresponding misfiring trace.

programs/winemenubuilder/winemenubuilder.c

@@ -296,7 +296,8 @@ static BOOL extract_icon32(LPCWSTR szFileName, int nIndex, const char *szXPMFile
         sEnumRes.pResInfo = &hResInfo;
         sEnumRes.nIndex = nIndex;
         if (!EnumResourceNamesW(hModule, (LPCWSTR)RT_GROUP_ICON,
-                                EnumResNameProc, (LONG_PTR)&sEnumRes))
+                                EnumResNameProc, (LONG_PTR)&sEnumRes) &&
+            sEnumRes.nIndex != 0)
         {
             WINE_TRACE("EnumResourceNamesW failed, error %d\n", GetLastError());
         }