Original commit message from CVS:
2006-02-19  Julien MOUTTE  <julien@moutte.net>

* gst/gstinfo.h: Add GST_STR_NULL to the second string.
* gst/gstpad.c: (gst_pad_set_event_function),
(gst_pad_set_query_function), (gst_pad_set_query_type_function),
(gst_pad_set_getcaps_function): GST_DEBUG_PAD_NAME evaluates to
2 strings. You can't use the STR_NULL macro on that.