app/testpmd: verify strdup return

[ upstream commit 365cdd7d01f70da2b10671aea05c5aaa036d3771 ]

Add verify strdup return value logic.

Fixes: 52e2e7e ("app/testpmd: add protocol-based buffer split")

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Ivan Malov <ivan.malov@arknetworks.am>
Acked-by: Huisong Li <lihuisong@huawei.com>

app/test-pmd/cmdline.c

@@ -3454,6 +3454,8 @@ parse_hdrs_list(const char *str, const char *item_name, unsigned int max_items,
 
 	nb_item = 0;
 	char *str2 = strdup(str);
+	if (str2 == NULL)
+		return nb_item;
 	cur = strtok_r(str2, ",", &tmp);
 	while (cur != NULL) {
 		parsed_items[nb_item] = get_ptype(cur);