btrfs: remove a pointless NULL check in btrfs_lookup_fs_root

btrfs_grab_root already checks for a NULL root itself.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c53c82c..06dab9d 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1157,8 +1157,7 @@ static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
        spin_lock(&fs_info->fs_roots_radix_lock);
        root = radix_tree_lookup(&fs_info->fs_roots_radix,
                                 (unsigned long)root_id);
-       if (root)
-               root = btrfs_grab_root(root);
+       root = btrfs_grab_root(root);
        spin_unlock(&fs_info->fs_roots_radix_lock);
        return root;
 }