btrfs: remove redundant error check
While running btrfs_mksubvol(), d_really_is_positive() is called twice. First in btrfs_mksubvol() and second inside btrfs_may_create(). So I remove the first one. Signed-off-by: NByongho Lee <bhlee.kernel@gmail.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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