btrfs: csum_tree_block: return proper errno value
Signed-off-by: NAlex Lyakas <alex@zadarastorage.com> Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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Signed-off-by: NAlex Lyakas <alex@zadarastorage.com> Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>