Fix a compiler warning.
Fix a compiler warning.

* subversion/libsvn_fs_x/string_table.c
  (svn_fs_x__string_table_builder_add): Remove an unnecessary cast, both sides
    of the assignment are int.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1575374 13f79535-47bb-0310-9956-ffa450edef68

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