btrfs: remove redundant check of btrfs_iget return value
'btrfs_iget()' can not return NULL, so this test can be removed. Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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