scsi: hpsa: Fix configured_logical_drive_count·check

Check whether configured_logical_drive_count is less than 255. Previous
check was always evaluating to true as this variable is defined as u8.

Signed-off-by: Christos Gkekas <chris.gekas@gmail.com>
Acked-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>