[PATCH] virtiofsd: Fix check of chown()'s return value

[Greg Kurz]

Otherwise you always get this warning when using --socket-group=users

 vhost socket failed to set group to users (100)

While here, print out the error if chown() fails.

Signed-off-by: Greg Kurz <gr...@kaod.org>
---
 tools/virtiofsd/fuse_virtio.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c
index 3e13997406bf..638d3ffe2f8a 100644
--- a/tools/virtiofsd/fuse_virtio.c
+++ b/tools/virtiofsd/fuse_virtio.c
@@ -978,9 +978,9 @@ static int fv_create_listen_socket(struct fuse_session *se)
     if (se->vu_socket_group) {
         struct group *g = getgrnam(se->vu_socket_group);
         if (g) {
-            if (!chown(se->vu_socket_path, -1, g->gr_gid)) {
+            if (chown(se->vu_socket_path, -1, g->gr_gid) == -1) {
                 fuse_log(FUSE_LOG_WARNING,
-                         "vhost socket failed to set group to %s (%d)\n",
+                         "vhost socket failed to set group to %s (%d): %m\n",
                          se->vu_socket_group, g->gr_gid);
             }
         }