cosmetic: Add missing \n on log line

The final log lone in find_endpoint() lacks the \n causing a messed
up log output.

- Add missing \n

Change-Id: I97fca654b199dfb7aae2359322a56c6d0bae9599
diff --git a/src/libosmo-mgcp/mgcp_msg.c b/src/libosmo-mgcp/mgcp_msg.c
index f533d55..89046c0 100644
--- a/src/libosmo-mgcp/mgcp_msg.c
+++ b/src/libosmo-mgcp/mgcp_msg.c
@@ -202,7 +202,7 @@
 		}
 	}
 
-	LOGP(DLMGCP, LOGL_ERROR, "Not able to find a free endpoint");
+	LOGP(DLMGCP, LOGL_ERROR, "Not able to find a free endpoint\n");
 	return NULL;
 }