hisi_sas: optimize the code convention.

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

optimize the code convention, using the slot after NULL checked.
Signed-off-by: NYupeng Zhou <zhouyupeng1@huawei.com>
Reviewed-by: Nluojian <luojian5@huawei.com>
Reviewed-by: Nchenxiang <chenxiang66@hisilicon.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -1223,11 +1223,11 @@ static int hisi_sas_exec_internal_tmf_task(struct domain_device *device,
 		if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 			if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 				struct hisi_sas_slot *slot = task->lldd_task;
-				struct hisi_sas_cq *cq =
-					&hisi_hba->cq[slot->dlvry_queue];
 
 				dev_err(dev, "abort tmf: TMF task timeout and not done\n");
 				if (slot) {
+					struct hisi_sas_cq *cq =
+						&hisi_hba->cq[slot->dlvry_queue];
 					/*
 					 * flush tasklet to avoid free'ing task
 					 * before using task in IO completion
@@ -2075,10 +2075,10 @@ _hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba,
 	if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 		if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 			struct hisi_sas_slot *slot = task->lldd_task;
-			struct hisi_sas_cq *cq =
-				&hisi_hba->cq[slot->dlvry_queue];
 
 			if (slot) {
+				struct hisi_sas_cq *cq =
+					&hisi_hba->cq[slot->dlvry_queue];
 				/*
 				 * flush tasklet to avoid free'ing task
 				 * before using task in IO completion