[handover] lchan use count handling in case of trans_lchan_change()
diff --git a/openbsc/src/transaction.c b/openbsc/src/transaction.c
index 9f1bbf3..0269288 100644
--- a/openbsc/src/transaction.c
+++ b/openbsc/src/transaction.c
@@ -152,7 +152,12 @@
 
 	llist_for_each_entry(trans, &net->trans_list, entry) {
 		if (trans->lchan == lchan_old) {
+			/* drop old channel use cound */
+			put_lchan(trans->lchan);
+			/* assign new channel */
 			trans->lchan = lchan_new;
+			/* bump new channel use count */
+			use_lchan(trans->lchan);
 			num++;
 		}
 	}