[PATCH v5 12/16] net/vdev_netvsc: readlink inputs cannot be aliased

[Andy Green <andy@warmcat.com>]

/home/agreen/projects/dpdk/drivers/net/vdev_netvsc/
vdev_netvsc.c:335:2:error: passing argument 2 to restrict-
qualified parameter aliases with argument 1 [-Werror=restrict]
  ret = readlink(buf, buf, size);
  ^~~

Signed-off-by: Andy Green <andy@warmcat.com>
Fixes: e7dc5d7becc5 ("net/vdev_netvsc: implement core functionality")
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 drivers/net/vdev_netvsc/vdev_netvsc.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/vdev_netvsc/vdev_netvsc.c b/drivers/net/vdev_netvsc/vdev_netvsc.c
index c321a9f1b..dca25761d 100644
--- a/drivers/net/vdev_netvsc/vdev_netvsc.c
+++ b/drivers/net/vdev_netvsc/vdev_netvsc.c
@@ -327,12 +327,14 @@ static int
 vdev_netvsc_sysfs_readlink(char *buf, size_t size, const char *if_name,
 			   const char *relpath)
 {
+	char in[160];
 	int ret;
 
-	ret = snprintf(buf, size, "/sys/class/net/%s/%s", if_name, relpath);
-	if (ret == -1 || (size_t)ret >= size)
+	ret = snprintf(in, sizeof(in) - 1, "/sys/class/net/%s/%s",
+		       if_name, relpath);
+	if (ret == -1 || (size_t)ret >= sizeof(in) - 1)
 		return -ENOBUFS;
-	ret = readlink(buf, buf, size);
+	ret = readlink(in, buf, size);
 	if (ret == -1)
 		return -errno;
 	if ((size_t)ret >= size - 1)