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We never checked for errors on add_disk() as this function returned void. Now that this is fixed, use the shiny new error handling. ubd_disk_register() never returned an error, so just fix that now and let the caller handle the error condition. Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Link: https://lore.kernel.org/r/20211015233028.2167651-8-mcgrof@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>