test: testOpenFromFile: return VIR_DRV_OPEN_SUCCESS in case of success

Signed-off-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/test/test_driver.c

@@ -1281,7 +1281,7 @@ testOpenFromFile(virConnectPtr conn, const char *file)
     xmlFreeDoc(doc);
     testDriverUnlock(privconn);
 
-    return 0;
+    return VIR_DRV_OPEN_SUCCESS;
 
  error:
     xmlXPathFreeContext(ctxt);