bindings: is_child_cgroup()
bindings: is_child_cgroup()

Enable is_child_cgroup() to be used with *at() family of functions.

Signed-off-by: Christian Brauner <b487c2d908f9548b106d14dc6d7b88a1fc58d1d6@suse.de>

Xeno22/lxcfs,Xeno22/lxcfs