seccomp: don't leak info on an error path

CID 154852 (#1 of 3): Resource leak (RESOURCE_LEAK)
32. leaked_storage: Variable info going out of scope leaks the storage it points to.

Reported-by: coverity
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>