Another bugfix, same fix as joe's other commit.
Another bugfix, same fix as joe's other commit.

* commit.c (record_prop_change): pass NULL stringbuf to
  svn_xml_escape_string().  This was causing property-commits over
  ra_dav to segfault.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion