builtin-branch: remove duplicated code

The previous optimization to --[no-]merged ended up with some duplicated
code which this patch removes.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-branch.c

@@ -214,7 +214,6 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
 	struct commit *commit;
 	int kind;
 	int len;
-	static struct commit_list branch;
 
 	/* Detect kind */
 	if (!prefixcmp(refname, "refs/heads/")) {
@@ -238,13 +237,9 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
 	if ((kind & ref_list->kinds) == 0)
 		return 0;
 
-	if (merge_filter != NO_FILTER) {
-		branch.item = lookup_commit_reference_gently(sha1, 1);
-		if (!branch.item)
-			die("Unable to lookup tip of branch %s", refname);
+	if (merge_filter != NO_FILTER)
 		add_pending_object(&ref_list->revs,
-				   (struct object *)branch.item, refname);
-	}
+				   (struct object *)commit, refname);
 
 	/* Resize buffer */
 	if (ref_list->index >= ref_list->alloc) {