ext/speex/: Miscellaneous clean-ups, among other things: speexenc => enc to enhance...

ext/speex/: Miscellaneous clean-ups, among other things: speexenc => enc to enhance code readability; change speexenc...

Original commit message from CVS:
* ext/speex/gstspeex.c: (plugin_init):
* ext/speex/gstspeexenc.c: (gst_speex_enc_get_formats),
(gst_speex_enc_setup_interfaces), (gst_speex_enc_base_init),
(gst_speex_enc_class_init), (gst_speex_enc_finalize),
(gst_speex_enc_sink_setcaps), (gst_speex_enc_convert_src),
(gst_speex_enc_convert_sink), (gst_speex_enc_get_query_types),
(gst_speex_enc_src_query), (gst_speex_enc_sink_query),
(gst_speex_enc_init), (gst_speex_enc_create_metadata_buffer),
(gst_speex_enc_set_last_msg), (gst_speex_enc_setup),
(gst_speex_enc_buffer_from_data), (gst_speex_enc_push_buffer),
(gst_speex_enc_set_header_on_caps), (gst_speex_enc_sinkevent),
(gst_speex_enc_chain), (gst_speex_enc_get_property),
(gst_speex_enc_set_property), (gst_speex_enc_change_state):
* ext/speex/gstspeexenc.h:
Miscellaneous clean-ups, among other things: speexenc => enc to
enhance code readability; change speexenc => speex_enc; in chain
function unref input buffer in case of error; take reference in
event function; use boilerplate macro; use gst_pad_query_peer_*
convenience functions.