scsi: aic94xx: Add missing error code assignment before test

It is likely that checking the result of 'pci_write_config_dword' is
expected here.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1 file changed