[Bug 796603] pitch: various improvements for use in GES

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796603

--- Comment #1 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 372695
  --> https://bugzilla.gnome.org/attachment.cgi?id=372695&action=edit
pitch: Fix single input buffer followed by EOS

The flush function immediately returned when pitch->next_buffer_offset
was 0.

This is clearly wrong, as next_buffer_offset can be 0 when a single
input buffer has been received, and no output buffer has been produced
before receiving EOS.

Simply remove that condition.

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