mgcp: Return with NULL if we fail the size check.
diff --git a/openbsc/src/mgcp/mgcp_protocol.c b/openbsc/src/mgcp/mgcp_protocol.c
index 32f467b..7d12659 100644
--- a/openbsc/src/mgcp/mgcp_protocol.c
+++ b/openbsc/src/mgcp/mgcp_protocol.c
@@ -290,6 +290,7 @@
 	mgcp_endp = mgcp_timeslot_to_endpoint(trunk - 1, endp);
 	if (mgcp_endp < 1 || mgcp_endp >= cfg->number_endpoints) {
 		LOGP(DMGCP, LOGL_ERROR, "Failed to find endpoint '%s'\n", mgcp);
+		return NULL;
 	}
 
 	return &cfg->endpoints[mgcp_endp];