prioq: add one more assertion

diff --git a/src/basic/prioq.c b/src/basic/prioq.c
index e816b2c62a5cf6ffd83ceeef4e910a99e25ac57c..1e4d8d1b2f9a1c6fa260e2c550ea40a3d0b9a031 100644 (file)
--- a/src/basic/prioq.c
+++ b/src/basic/prioq.c
@@ -88,6 +88,7 @@ static void swap(Prioq *q, unsigned j, unsigned k) {
 
 static unsigned shuffle_up(Prioq *q, unsigned idx) {
         assert(q);
+        assert(idx < q->n_items);
 
         while (idx > 0) {
                 unsigned k;