show_unixsk(): avoid buffer overflow
show_unixsk(): avoid buffer overflow

Say in case of corrupted img file

Signed-off-by: Kir Kolyshkin <c0159612b0ef32139322233232df1a0d189c4b9b@openvz.org>
Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>

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