fsck: fix broken loose object check.

When "git fsck" without --full found a loose object missing
because it was broken, it mistakenly thought it was not parsed
because we found it in one of the packs.  Back when this code
was written, we did not have a way to explicitly check if we
have the object in pack, but we do now.

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

builtin-fsck.c

@@ -67,7 +67,7 @@ static void check_reachable_object(struct object *obj)
 	 * do a full fsck
 	 */
 	if (!obj->parsed) {
-		if (has_sha1_file(obj->sha1))
+		if (has_sha1_pack(obj->sha1, NULL))
 			return; /* it is in pack - forget about it */
 		printf("missing %s %s\n", typename(obj->type), sha1_to_hex(obj->sha1));
 		return;