Follow-up to r1495063: integer overflows result in an inefficient hash function and reduce cache effectiveness.
Follow-up to r1495063: integer overflows result in an inefficient hash
function and reduce cache effectiveness.

* subversion/libsvn_fs_fs/tree.c
  (cache_lookup): prevent unnecessary integer overflows in hash function


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1495204 13f79535-47bb-0310-9956-ffa450edef68

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