rio: warn_unused_result warnings fix
Adding failure path for the following two cases. warning: ignoring return value of 'device_add', declared with attribute warn_unused_result warning: ignoring return value of 'sysfs_create_bin_file', declared with attribute warn_unused_result Signed-off-by: NLi Yang <leoli@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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