Revision 1484261

On the 1.6.x-issue4340 branch, filter control characters from an error message.

This corresponds to r1481627 on trunk, but the svn_path_illegal_path_escape()
API function used in that commit is not available in 1.6.x. So I've manually
marked the revision as merged using a --record-only merge.

* subversion/libsvn_fs_fs/tree.c
  (): Include svn_ctype.h for svn_ctype_iscntrl().
  (escape_newline): Rename to...
  (illegal_path_escape): ... this, and tweak the code to match the current
   implementation of svn_path_illegal_path_escape() on trunk.
  (check_newline): Update caller.