scsi: ufs: ufs-qcom: Remove unneeded variable 'err'

'err' is never set in this functon. Remove the declaration and just return
0.

Link: https://lore.kernel.org/r/20210907044111.29632-1-cw9316.lee@samsung.com


Signed-off-by: ChanWoo Lee <cw9316.lee@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>