Original commit message from CVS:
* gst/autodetect/gstautoaudiosink.c: (gst_auto_audio_sink_reset),
(gst_auto_audio_sink_find_best), (gst_auto_audio_sink_detect):
* gst/autodetect/gstautovideosink.c: (gst_auto_video_sink_reset),
(gst_auto_video_sink_find_best), (gst_auto_video_sink_detect):
Set state of elements to NULL before removing from bins.
Set state of test element to NULL if we failed to move it to READY