tunfile_open(): don't leak fd on error path
tunfile_open(): don't leak fd on error path

Reported by Coverity, CID 51640.

Signed-off-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@openvz.org>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@odin.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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