[Bug 719524] audiofxbaseiirfilter: check if coefficients are provided inside filter lock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719524
  GStreamer | gst-plugins-good | 1.2.1

--- Comment #3 from Darryl Gamroth <dgamroth at uvic.ca> 2014-02-10 01:17:27 UTC ---
The check is valid but it occurs outside the lock so while it's not possible to
call filter->process while the variables are NULL it is possible for the check
to fail if gst_audio_fx_base_iir_filter_set_coefficients is called while
playing.  Moving the check inside the lock prevents the race condition from
occurring.

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