Fixing a doc typo

Author: srdja

src/list.c

@@ -315,7 +315,7 @@ bool list_add_all_at(List *list1, List *list2, size_t index)
  return false;
 
  /* Link the new nodes together outside of the list so
- that if anything goes wrong we have don't leave
+ that if anything goes wrong we don't have leave
  garbage in the actual list. */
  Node *head = NULL;
  Node *tail = NULL;