Original commit message from CVS:
* gst/base/gstbasesink.c: (gst_base_sink_change_state):
Only error is an error.

* gst/gstbin.c: (gst_bin_change_state):
Better debugging.

* gst/gstpad.c: (gst_pad_alloc_buffer), (gst_pad_chain):
Also call pad_block in pad alloc.

* gst/gstutils.c: (gst_flow_get_name):
Better debugging.