(svn_string_ensure): Don't reallocate when not necessary.
(svn_string_ensure): Don't reallocate when not necessary.

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