scsi: qla2xxx: Fix NULL pointer access for fcport structure

when processing iocb in a timeout case, driver was trying to log messages
without verifying if the fcport structure could have valid data. This
results in a NULL pointer access.

Fixes: 726b8548("qla2xxx: Add framework for async fabric discovery")
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_init.c

@@ -102,11 +102,16 @@ qla2x00_async_iocb_timeout(void *data)
 	struct srb_iocb *lio = &sp->u.iocb_cmd;
 	struct event_arg ea;
 
+	if (fcport) {
 		ql_dbg(ql_dbg_disc, fcport->vha, 0x2071,
 		    "Async-%s timeout - hdl=%x portid=%06x %8phC.\n",
 		    sp->name, sp->handle, fcport->d_id.b24, fcport->port_name);
 
 		fcport->flags &= ~FCF_ASYNC_SENT;
+	} else {
+		pr_info("Async-%s timeout - hdl=%x.\n",
+		    sp->name, sp->handle);
+	}
 
 	switch (sp->type) {
 	case SRB_LOGIN_CMD: