pidns: remove unused is_container_init()
Since commit 1cdcbec1 ("CRED: Neuter sys_capset()") is_container_init() has no callers. Signed-off-by: NGao feng <gaofeng@cn.fujitsu.com> Cc: David Howells <dhowells@redhat.com> Acked-by: NSerge Hallyn <serge.hallyn@canonical.com> Cc: James Morris <jmorris@namei.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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