[Bug 1977870] [NEW] SRU fix for LP#1807628

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[Impact]

 * lxcfs will segfault if there are no non-directory files in a cgroup. This necessitates restarting running containers.
 * See LP#1807628 (https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1807628) for details on the impact.

[Test Plan]

 * Start LXC containers and HUP the lxcfs process.

[Where problems could occur]

 * Correcting the null pointer dereference could allow previously
undetected bugs masked by the segfault to be encountered.

[Other Info]
 
 * Proposed fix is upstream since version 3.0.4 with no negative impacts.
 * Proposed fix is a minimal cherry-pick of the fix, without other functional changes.

** Affects: lxcfs (Ubuntu)
     Importance: Undecided
     Assignee: Kellen Renshaw (krenshaw)
         Status: New


** Tags: patch
-- 
SRU fix for LP#1807628
https://bugs.launchpad.net/bugs/1977870
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