net/failsafe: fix memory leak in args parsing

[ upstream commit 2ddf2d7a15deeac3585e08fd7f9ef46ad082b126 ]

Should free the memory which allocated by strdup().

Fixes: a46f8d5 ("net/failsafe: add fail-safe PMD")

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>

drivers/net/failsafe/failsafe_args.c

@@ -248,7 +248,7 @@ fs_parse_device_param(struct rte_eth_dev *dev, const char *param,
 			goto free_args;
 	} else {
 		ERROR("Unrecognized device type: %.*s", (int)b, param);
-		return -EINVAL;
+		ret = -EINVAL;
 	}
 free_args:
 	free(args);