ext/libvisual/visual.c: Small cleanups.

ext/libvisual/visual.c: Small cleanups.

Original commit message from CVS:
* ext/libvisual/visual.c: (gst_visual_get_type),
(gst_visual_src_setcaps), (gst_vis_src_negotiate),
(gst_visual_chain):
Small cleanups.
* ext/theora/gsttheoradec.h:
* ext/theora/theoradec.c: (gst_theora_dec_init),
(gst_theora_dec_reset), (_theora_granule_time),
(theora_dec_src_convert), (theora_dec_sink_convert),
(theora_dec_src_query), (theora_dec_src_event),
(theora_dec_sink_event), (theora_handle_comment_packet),
(theora_handle_header_packet), (theora_dec_push),
(theora_handle_data_packet), (theora_dec_chain),
(theora_dec_change_state):
Add simple QoS.