libipt: apply pip when tracing is disabled

When tracing is disabled, e.g. because of filtering, apply a paging event
immediately.  We won't be able to bind it to an instruction and we must
continue processing events to see the subsequent enable event.

Change-Id: I6b704f0fe37a037e197c4aeea0453f958e6ad455
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>