[Bug 789475] omx: wait for flush complete and buffers being released when flushing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789475

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 362253
  --> https://bugzilla.gnome.org/attachment.cgi?id=362253&action=edit
gst_omx_port_set_flushing: simplify waiting loop

No semantic change so far, I just made the 'while' end condition easier
to understand as a first step before changing it.
- move error/time out checks inside the loop to make it clearer on what
we are actually waiting for.
- group port->buffers checks together with parenthesis as they are part
of the same conceptual check: waiting for all buffers to be released.

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