[SCSI] qla2xxx: Correct display of ISP serial-number.

The original serial-number calculations based on WWPN no longer
apply to newer ISPs (ISP24xx and ISP25xx).  These newer board's
serial number reside in the VPD.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/qla2xxx/qla_attr.c

@@ -538,6 +538,9 @@ qla2x00_serial_num_show(struct class_device *cdev, char *buf)
 	scsi_qla_host_t *ha = shost_priv(class_to_shost(cdev));
 	uint32_t sn;
 
+	if (IS_FWI2_CAPABLE(ha))
+		return snprintf(buf, PAGE_SIZE, "\n");
+
 	sn = ((ha->serial0 & 0x1f) << 16) | (ha->serial2 << 8) | ha->serial1;
 	return snprintf(buf, PAGE_SIZE, "%c%05d\n", 'A' + sn / 100000,
 	    sn % 100000);