net/mlx5: fix decap action checking in sample flow

[ upstream commit c40023aece2ec9a7899fafecf474d7337212776e ]

This patch uses the temp variable to check the current action type,
to avoid overlap the sample action following the decap.

Fixes: 7356aec ("net/mlx5: fix mirror flow split with L3 encapsulation")

Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Acked-by: Suanming Mou <suanmingm@nvidia.com>

drivers/net/mlx5/mlx5_flow.c

@@ -5513,6 +5513,7 @@ flow_check_match_action(const struct rte_flow_action actions[],
 {
 	const struct rte_flow_action_sample *sample;
 	const struct rte_flow_action_raw_decap *decap;
+	const struct rte_flow_action *action_cur = NULL;
 	int actions_n = 0;
 	uint32_t ratio = 0;
 	int sub_type = 0;
@@ -5573,12 +5574,12 @@ flow_check_match_action(const struct rte_flow_action actions[],
 			break;
 		case RTE_FLOW_ACTION_TYPE_RAW_DECAP:
 			decap = actions->conf;
-			while ((++actions)->type == RTE_FLOW_ACTION_TYPE_VOID)
+			action_cur = actions;
+			while ((++action_cur)->type == RTE_FLOW_ACTION_TYPE_VOID)
 				;
-			actions_n++;
-			if (actions->type == RTE_FLOW_ACTION_TYPE_RAW_ENCAP) {
+			if (action_cur->type == RTE_FLOW_ACTION_TYPE_RAW_ENCAP) {
 				const struct rte_flow_action_raw_encap *encap =
-								actions->conf;
+								action_cur->conf;
 				if (decap->size <=
 					MLX5_ENCAPSULATION_DECISION_SIZE &&
 				    encap->size >