shmem: used open_proc_rw to open proc files
shmem: used open_proc_rw to open proc files

open_proc_rw knows that proc may be mounted not in /proc,
it's used for restoring tasks in pid ns.

Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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