ext/ffmpeg/gstffmpegdemux.c: Fix demuxer to stop properly (emit an error message on the bus) if no pads are linked. U...

Original commit message from CVS:
* ext/ffmpeg/gstffmpegdemux.c: (gst_ffmpegdemux_loop):
Fix demuxer to stop properly (emit an error message on the bus) if no
pads are linked. Use aggregated flow return values a bit more.