scsi: ufs: Remove the 'update_scaling' local variable

This patch does not change any functionality but makes the next patch in
this series easier to read.

Link: https://lore.kernel.org/r/20211203231950.193369-12-bvanassche@acm.org


Tested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>