On svn-auth-x509 branch, cast to avoid sign mistmatch warning.
On svn-auth-x509 branch, cast to avoid sign mistmatch warning.

* subversion/libsvn_subr/x509parse.c:
  (svn_x509_parse_cert): Cast buf to unsigned before doing arithmetic with it.


git-svn-id: f69d95e79bd5010e6e46130ecc63a181c542bb30@1605804 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion