scsi: qla2xxx: Change the return type of qla24xx_read_flash_data()

This change makes it easier to detect qla24xx_read_flash_data() failures
and also to handle such failures. This change does not modify the behavior
of the driver since all callers ignore the qla24xx_read_flash_data()
return value.

Cc: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Himanshu Madhani <hmadhani@marvell.com>
Reviewed-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_gbl.h

@@ -554,7 +554,7 @@ fc_port_t *qla2x00_find_fcport_by_nportid(scsi_qla_host_t *, port_id_t *, u8);
  * Global Function Prototypes in qla_sup.c source file.
  */
 extern void qla2x00_release_nvram_protection(scsi_qla_host_t *);
-extern uint32_t *qla24xx_read_flash_data(scsi_qla_host_t *, uint32_t *,
+extern int qla24xx_read_flash_data(scsi_qla_host_t *, uint32_t *,
     uint32_t, uint32_t);
 extern uint8_t *qla2x00_read_nvram_data(scsi_qla_host_t *, void *, uint32_t,
     uint32_t);

drivers/scsi/qla2xxx/qla_sup.c

@@ -473,22 +473,24 @@ qla24xx_read_flash_dword(struct qla_hw_data *ha, uint32_t addr, uint32_t *data)
 	return QLA_FUNCTION_TIMEOUT;
 }
 
-uint32_t *
+int
 qla24xx_read_flash_data(scsi_qla_host_t *vha, uint32_t *dwptr, uint32_t faddr,
     uint32_t dwords)
 {
 	ulong i;
+	int ret = QLA_SUCCESS;
 	struct qla_hw_data *ha = vha->hw;
 
 	/* Dword reads to flash. */
 	faddr =  flash_data_addr(ha, faddr);
 	for (i = 0; i < dwords; i++, faddr++, dwptr++) {
-		if (qla24xx_read_flash_dword(ha, faddr, dwptr))
+		ret = qla24xx_read_flash_dword(ha, faddr, dwptr);
+		if (ret != QLA_SUCCESS)
 			break;
 		cpu_to_le32s(dwptr);
 	}
 
-	return dwptr;
+	return ret;
 }
 
 static int