cgroups/cgfsng: rework cgfsng_num_hierarchies()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/cgroups/cgfsng.c b/src/lxc/cgroups/cgfsng.c
index 932425e813cdf61e3dc949108653999b17311095..f52d61dad550180b7ee8e89f47adf1524cbcac01 100644 (file)
--- a/src/lxc/cgroups/cgfsng.c
+++ b/src/lxc/cgroups/cgfsng.c
@@ -1966,6 +1966,9 @@ __cgfsng_ops static int cgfsng_num_hierarchies(struct cgroup_ops *ops)
 {
        int i = 0;
 
+       if (!ops)
+               return ret_set_errno(-1, ENOENT);
+
        if (!ops->hierarchies)
                return 0;