Fixes a memcpy call with nullptr in cn (UBSAN).
Updates:
@@ -112,6 +112,9 @@ kvset_iterv_release(uint iterc, struct kv_iterator **iterv, struct workqueue_str
size_t sz, itervsz;
uint i;
+ if (!iterc)
+ return;
+
if (wq) {
itervsz = sizeof(w->kir_iterv[0]) * iterc;
sz = sizeof(*w) + itervsz;
