mshtml: Fix nsIFile dir leak in init_xpcom.

dlls/mshtml/nsembed.c

@@ -561,6 +561,7 @@ static BOOL init_xpcom(const PRUnichar *gre_path)
     }
 
     nsres = NS_InitXPCOM2(&pServMgr, gre_dir, (nsIDirectoryServiceProvider*)&nsDirectoryServiceProvider2);
+    nsIFile_Release(gre_dir);
     if(NS_FAILED(nsres)) {
         ERR("NS_InitXPCOM2 failed: %08lx\n", nsres);
         FreeLibrary(xul_handle);