Return if error loading cgroup CleanupConmonCgroup
Return if error loading cgroup CleanupConmonCgroup

Return before using nil cgroup if there was an error loading conmon cgroup for a container

Signed-off-by: Marius Grigoriu <2ba81476bba8d33dc15ae01754bf12904cca6248@me.com>
mikebrow/cri-o,mikebrow/cri-o,nalind/cri-o,mikebrow/cri-o,kubernetes-incubator/ocid,nalind/cri-o,mikebrow/cri-o,nalind/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/ocid,kubernetes-incubator/cri-o