mncc.c: Ensure proper string buffer NUL termination

Change-Id: I2f58a495f60ed744c1f625dc8df56aa4dc0aa4cb
Fixes: Coverity CID#92223

src/mncc.c

@@ -738,7 +738,7 @@ int mncc_create_remote_leg(struct mncc_connection *conn, struct call *call)
 	mncc.fields |= MNCC_F_CALLING;
 	mncc.calling.plan = 1;
 	mncc.calling.type = 0x0;
-	strncpy(mncc.calling.number, call->source, sizeof(mncc.calling.number));
+	osmo_strlcpy(mncc.calling.number, call->source, sizeof(mncc.calling.number));
 
 	if (conn->app->use_imsi_as_id) {
 		snprintf(mncc.imsi, 15, "%s", call->dest);
@@ -746,7 +746,7 @@ int mncc_create_remote_leg(struct mncc_connection *conn, struct call *call)
 		mncc.fields |= MNCC_F_CALLED;
 		mncc.called.plan = 1;
 		mncc.called.type = 0x0;
-		strncpy(mncc.called.number, call->dest, sizeof(mncc.called.number));
+		osmo_strlcpy(mncc.called.number, call->dest, sizeof(mncc.called.number));
 	}
 
 	/*