Fix compiler warning.
Fix compiler warning.

* text_delta.c
  (svn_txdelta): there is nothing to return for void

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