scsi: ufs-bsg: fix typo in ufs_bsg_request

Correct dev_dbg to dev_err, so as to print out the error information in
case of DME command failed.

Signed-off-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>