imsm: fix reading scsi serial
Improve error detection after SG_IO ioctl. Checking only the return value and response length is insufficient and leads to anomalies if a drive does not have a serial number. Reported-by: NeilBrown <neilb@suse.com> Tested-by: NeilBrown <neilb@suse.com> Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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