The following functions return immediately if a null pointer was passed.
* container_destroy
* lxc_cgroup_process_info_free_and_remove
* lxc_cgroup_put_meta
* toss_list

It is therefore not needed that a function caller repeats a corresponding check.

This issue was fixed by using the software Coccinelle 1.0.0-rc23.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>