btrfs-progs: restore: don't misreport errors from search_dir

The logic around return value has changed in the metadata restore
patches. The return value from btrfs_search_slot may remain non-zero and
is returned. This is incorrectly interpreted as an error.

Signed-off-by: David Sterba <dsterba@suse.cz>

cmds-restore.c

@@ -812,6 +812,8 @@ static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
 		goto out;
 	}
 
+	ret = 0;
+
 	leaf = path->nodes[0];
 	while (!leaf) {
 		if (verbose > 1)