* xterm.h (x_catch_errors) Return value changed to void.

* xterm.h (x_catch_errors) Return value changed to void.
	(x_uncatch_errors): Unused count argument deleted.

	* xterm.c (x_catch_errors): Don't use record_unwind_protect, since
	it can be called in a signal handler.
	(x_catch_errors_unwind): Function deleted.
	(x_uncatch_errors): Deallocate last x_error_message_stack struct.
	(x_check_errors): Call x_uncatch_errors before signalling error.

	(x_load_font, x_term_init, XTmouse_position, handle_one_xevent)
	(x_connection_closed, x_list_fonts): Use new versions of
	x_catch_errors and x_uncatch_errors.

	* xselect.c (x_own_selection, x_decline_selection_request)
	(x_reply_selection_request, x_get_foreign_selection)
	(Fx_get_atom_name, Fx_send_client_event): Likewise.

	* xfns.c (x_real_positions, x_set_mouse_color, Fx_focus_frame):
	Likewise.

	* eval.c (record_unwind_protect): Add an assertion.