Input: do not try to filter out events if handler is not a filter

If given input handler is not a filter there is no point is iterating list
of events in a packet to see if some of them need to be filtered out.

Signed-off-by: Anshul Garg <anshul.g@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>