msi: Fix memory leak on error path in MSI_OpenPackageW (scan-build).

dlls/msi/package.c

@@ -1411,7 +1411,10 @@ UINT MSI_OpenPackageW(LPCWSTR szPackage, DWORD dwOptions, MSIPACKAGE **pPackage)
         TRACE("opening package %s\n", debugstr_w( localfile ));
         r = MSI_OpenDatabaseW( localfile, MSIDBOPEN_TRANSACT, &db );
         if (r != ERROR_SUCCESS)
+        {
+            free( product_version );
             return r;
+        }
 
         if (product_version)
         {