Revision 1864025

fsfs, fsx: Make an error message clearer to developers.

* subversion/libsvn_fs_fs/low_level.c
  (svn_fs_fs__parse_footer),
* subversion/libsvn_fs_x/low_level.c
  (svn_fs_x__parse_footer):
    Make the output radix explicit, so the values aren't mistaken for decimal.
    (Actually, I wonder why the values aren't printed in decimal to begin with.)