[SCSI] qla2xxx: Correct truncation in return-code status checking.

QLA_* return codes are 'int' in size.  There were still several
legacy check-points which assumed a return-code width of 8-bits.
This could cause incorrect assumptions of 'good' status if a
return of QLA_FUNCTION_TIMEOUT.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>