Fix logic bug introduced in r27613.
Fix logic bug introduced in r27613.

Found by: glasser

* subversion/libsvn_ra_svn/client.c
  (ra_svn_has_capability): Don't fall through to error condition when
    what we really want to do is set *has to false.

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