[lxc-devel] [lxc/lxc] bccf73: cgroups: fix potential nullderef

[Christian Brauner]

  Branch: refs/heads/stable-3.0
  Home:   https://github.com/lxc/lxc
  Commit: bccf738c78b8a136a98603de31686579bba0fc2f
      https://github.com/lxc/lxc/commit/bccf738c78b8a136a98603de31686579bba0fc2f
  Author: Christian Brauner <christian.brauner at ubuntu.com>
  Date:   2019-04-14 (Sun, 14 Apr 2019)

  Changed paths:
    M src/lxc/cgroups/cgfsng.c

  Log Message:
  -----------
  cgroups: fix potential nullderef

The child_path variable is initialized very late in the function so jumping to
the on_error label would cause a nullderef. With the cleanup macros we can
simplify this function to simply do direct returns and avoid that whole issue.

Closes #2935.

Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>