client: Do not accept endpoint ids with wildcards in responses

When the client gets a specific endpoint identifier (Z) in a
MGCP response it just accepts the identifier even when it is
not specific (contsins wildcard characters). In those cases,
the client should refuse to parse the response.

- Check for wildcards in endpoint identifiers and stop
  parsing when check is positive.

Change-Id: Ic94bd8c025b7b3eb006b639fecfd7282194e504a
diff --git a/src/libosmo-mgcp-client/mgcp_client.c b/src/libosmo-mgcp-client/mgcp_client.c
index 771de45..d868c7f 100644
--- a/src/libosmo-mgcp-client/mgcp_client.c
+++ b/src/libosmo-mgcp-client/mgcp_client.c
@@ -356,6 +356,13 @@
 						   'Z', line);
 			if (rc)
 				goto exit;
+
+			/* A specific endpoint identifier returned by the MGW
+			 * must not contain any wildcard characters */
+			if (strstr(r->head.endpoint, "*") != NULL) {
+				rc = -EINVAL;
+				goto exit;
+			}
 			break;
 		case 'I':
 			rc = mgcp_parse_head_param(r->head.conn_id,