commit-reach(paint_down_to_common): plug two memory leaks

When a commit is missing, we return early (currently pretending that no
merge basis could be found in that case). At that stage, it is possible
that a merge base could have been found already, and added to the
`result`, which is now leaked.

The priority queue has a similar issue: There might still be a commit in
that queue.

Let's release both, to address the potential memory leaks.

Signed-off-by: Johannes Schindelin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: dscho

commit-reach.c

@@ -104,8 +104,11 @@ static struct commit_list *paint_down_to_common(struct repository *r,
 			parents = parents->next;
 			if ((p->object.flags & flags) == flags)
 				continue;
-			if (repo_parse_commit(r, p))
+			if (repo_parse_commit(r, p)) {
+				clear_prio_queue(&queue);
+				free_commit_list(result);
 				return NULL;
+			}
 			p->object.flags |= flags;
 			prio_queue_put(&queue, p);
 		}