* exceptions.cc (try_to_debug): Fix off-by-one problem when resetting

environment variable after error_start detected.
* fhandler_tty_slave.cc (fhandler_tty_slave::close): Clarify debug message.
* syscalls.cc (setsid): Don't increment usecount here, since it will be
automatically decremented on close.

winsup/cygwin/fhandler_tty.cc

@@ -620,7 +620,7 @@ fhandler_tty_slave::close ()
       if (archetype->usecount < 0)
 	system_printf ("usecount %d", archetype->usecount);
 #endif
-      termios_printf ("just exiting because archetype usecount is > 0");
+      termios_printf ("just returning because archetype usecount is > 0");
       return 0;
     }