gst/gstbin.c (gst_bin_get_state_func): Renamed from gst_bin_get_state, cleaned up (but no logic changes).

Original commit message from CVS:
2005-10-10  Andy Wingo  <wingo@pobox.com>

* gst/gstbin.c (gst_bin_get_state_func): Renamed from
gst_bin_get_state, cleaned up (but no logic changes).
(bin_element_is_sink): Comment updates.
(sink_iterator_filter): Remove needless cast.
(gst_bin_iterate_sinks): Doc update.
(gst_bin_change_state_func): Renamed from gst_bin_change_state,
cleaned up (but no logic changes).