scsi: a100u2w: Remove unused variable biosaddr

The variable biosaddr is being assigned a value that is never read, the
variable is redundant and can be safely removed.

Link: https://lore.kernel.org/r/20210325170731.484651-1-colin.king@canonical.com


Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>