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 af99c41b973bc88837927f204c7a7194cedcf4be..92531e084c6e6f26ea366506627b242885816ab6 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;