Bug 614511 - fix coverify Defect Type: Null pointer dereferences issues 11846 - 11891

https://bugzilla.redhat.com/show_bug.cgi?id=614511
Resolves: bug 614511
Bug description: Fix coverify Defect Type: Null pointer dereferences issues 11846 - 11891
description: Catch possible NULL pointer in decode_repl_ext_response().

ldap/servers/plugins/replication/repl_extop.c

@@ -583,7 +583,7 @@ decode_repl_ext_response(struct berval *bvdata, int *response_code,
 	}
 	if (0 != return_value)
 	{
-		if (NULL != *ruv_bervals)
+		if (NULL != ruv_bervals && NULL != *ruv_bervals)
 		{
 			ber_bvecfree(*ruv_bervals);
 		}