proc: fix memory leak

timer is not freed in case of eof.

CID 1042301 (#1 of 1): Resource leak (RESOURCE_LEAK)
15. leaked_storage: Variable timer going out of scope leaks the storage it points to.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>