netrom: Decrease sock refcount when sock timers expire

Commit 63346650 ("netrom: switch to sock timer API") switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().

Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.

Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com>
Reported-by:  <syzbot+10f1194569953b72f1ae@syzkaller.appspotmail.com>
Fixes: 63346650 ("netrom: switch to sock timer API")
Signed-off-by: David S. Miller <davem@davemloft.net>