gfs2: Use wait_event_freezable_timeout() 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_timeout();

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

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

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