[Bug 719524] New: 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

           Summary: audiofxbaseiirfilter: check if coefficients are
                    provided inside filter lock
    Classification: Platform
           Product: GStreamer
           Version: 1.2.1
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: dgamroth at uvic.ca
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


In transform_ip the filter coefficients are checked outside of the lock so it's
possible for the values to be NULL.  Move the check inside the lock.

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