Original commit message from CVS: * ext/mpeg2dec/gstmpeg2dec.c: (gst_mpeg2dec_reset), (gst_mpeg2dec_alloc_buffer), (gst_mpeg2dec_negotiate_format), (handle_sequence), (handle_picture), (handle_slice), (gst_mpeg2dec_chain), (gst_mpeg2dec_src_query), (normal_seek), (gst_mpeg2dec_src_event), (gst_mpeg2dec_change_state): Forward GstFlowReturn about everywhere. Handle seeking correctly.