memcg: clean up force_empty_list() return value check
After bf544fdc241da8 "memcg: move charges to root cgroup if use_hierarchy=0 in mem_cgroup_move_hugetlb_parent()" mem_cgroup_move_parent() returns only -EBUSY or -EINVAL. So we can remove the -ENOMEM and -EINTR checks. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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