* subversion/libsvn_subr/string.c
  (svn__i64toa): Use correct operation order to prevent integer overflow
                 for NUMBER==UINT64_MIN.

Found by: philipm

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1632636 13f79535-47bb-0310-9956-ffa450edef68