remap: Keep nsid on remap rollback, not the ns' pid
remap: Keep nsid on remap rollback, not the ns' pid

This is more logical -- we should remap file in namespace,
not in pid. Also this would help to clean the code further.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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