media: pvrusb2: Use wait_event_freezable() for freezable kthread

media: pvrusb2: Use wait_event_freezable() for freezable kthread

A freezable kernel thread can enter frozen state during freezing by
either calling try_to_freeze() or using wait_event_freezable() and its
variants. So for the following snippet of code in a kernel thread loop:
  try_to_freeze();
  wait_event_interruptible();

We can change it to a simple wait_event_freezable() and then eliminate
a function call.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>