* path.h (etc::change_possible): Revert the type to bool.

(etc::set_last_modified): Remove obsolete function.
* path.cc (etc::change_possible): Revert type to bool.
(etc::test_file_change): Do not test for negative values of change_possible and
do not set it to -res.
(etc::dir_changed): When the handle is NULL, call memset instead of
test_file_changed.  When the handle is invalid, return true.
(etc::file_changed): Remove unneeded check for !fn[n].

winsup/cygwin/uinfo.cc

@@ -452,7 +452,6 @@ pwdgrp::load (const char *posix_fname)
 	      if (buf)
 		free (buf);
 	      buf = NULL;
-	      fh = NULL;
 	      res = false;
 	    }
 	  else