[CRIU] ✗ ci.openvz.org: failure for mount: Add a detailed error message when opts.root is NULL

[Patchwork]

== Series Details ==

Series: mount: Add a detailed error message when opts.root is NULL
URL   : https://patchwork.criu.org/series/2956/
State : failure

== Logs ==

For more details see: https://ci.openvz.org/job/CRIU/job/criu-patchwork/2004//console