scsi: qedf: Remove redundant variable op

The variable 'op' is assigned a value and is never read. The variable is
not used and is redundant, remove it.

Link: https://lore.kernel.org/r/20220517092518.93159-1-colin.i.king@gmail.com
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>