receive-pack: plug memory leak in fast-forward checking code.

Signed-off-by: NJunio C Hamano <junkio@cox.net>

receive-pack.c

@@ -131,17 +131,18 @@ static int update(struct command *cmd)
 	}
 	if (deny_non_fast_forwards && !is_null_sha1(old_sha1)) {
 		struct commit *old_commit, *new_commit;
-		struct commit_list *bases;
+		struct commit_list *bases, *ent;
 
 		old_commit = (struct commit *)parse_object(old_sha1);
 		new_commit = (struct commit *)parse_object(new_sha1);
-		for (bases = get_merge_bases(old_commit, new_commit, 1);
-				bases; bases = bases->next)
-			if (!hashcmp(old_sha1, bases->item->object.sha1))
+		bases = get_merge_bases(old_commit, new_commit, 1);
+		for (ent = bases; ent; ent = ent->next)
+			if (!hashcmp(old_sha1, ent->item->object.sha1))
 				break;
-		if (!bases)
+		free_commit_list(bases);
+		if (!ent)
 			return error("denying non-fast forward;"
-					" you should pull first");
+				     " you should pull first");
 	}
 	safe_create_leading_directories(lock_name);