scsi: 53c700: Open-code status_byte(u8) calls

The 53c700 driver is one of the two drivers that passes an u8 argument to
status_byte() instead of an s32 argument. Open-code status_byte in
preparation of changing SCSI status values into a structure.

Link: https://lore.kernel.org/r/20210415220826.29438-15-bvanassche@acm.org


Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>