files: No getpid in vain

Each opening of a file results in getpid() call which
is now a pure syscall :( For this particular case this
value is poitless, as log engine already prints pids.

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>