[Bug 711606] New: applemedia: coremediabuffer: use correct retain/release functions on CMSampleBufferRef buffer

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=711606
  GStreamer | gst-plugins-bad | git

           Summary: applemedia: coremediabuffer: use correct
                    retain/release functions on CMSampleBufferRef buffer
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matthieu.bouron at collabora.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


CFRetain/CFRelease should be used instead of CVBufferRetain/CVBufferRelease
according to the documentation.

It fixes a crash while releasing the sample buffer after the image buffer it
contains.

Also fixes a minor coding style error.

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