scsi: qla2xxx: Declare fourth qla2x00_set_model_info() argument const

Make it clear to humans and also to the compiler that the string passed
as fourth argument is not modified.

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

@@ -822,8 +822,8 @@ extern int qla82xx_device_state_handler(scsi_qla_host_t *);
 extern void qla8xxx_dev_failed_handler(scsi_qla_host_t *);
 extern void qla82xx_clear_qsnt_ready(scsi_qla_host_t *);
 
-extern void qla2x00_set_model_info(scsi_qla_host_t *, uint8_t *,
-				   size_t, char *);
+extern void qla2x00_set_model_info(scsi_qla_host_t *, uint8_t *, size_t,
+				   const char *);
 extern int qla82xx_mbx_intr_enable(scsi_qla_host_t *);
 extern int qla82xx_mbx_intr_disable(scsi_qla_host_t *);
 extern void qla82xx_start_iocbs(scsi_qla_host_t *);

drivers/scsi/qla2xxx/qla_init.c

@@ -4426,7 +4426,7 @@ qla2x00_configure_hba(scsi_qla_host_t *vha)
 
 inline void
 qla2x00_set_model_info(scsi_qla_host_t *vha, uint8_t *model, size_t len,
-	char *def)
+		       const char *def)
 {
 	char *st, *en;
 	uint16_t index;