input: Remove wl_seat destroy signal

We already have one on weston_seat.

src/clipboard.c

@@ -270,7 +270,7 @@ clipboard_create(struct weston_seat *seat)
 
 	wl_signal_add(&seat->seat.selection_signal,
 		      &clipboard->selection_listener);
-	wl_signal_add(&seat->seat.destroy_signal,
+	wl_signal_add(&seat->destroy_signal,
 		      &clipboard->destroy_listener);
 
 	return clipboard;

src/compositor.h

@@ -330,7 +330,6 @@ struct weston_touch {
 
 struct wl_seat {
 	struct wl_list base_resource_list;
-	struct wl_signal destroy_signal;
 
 	struct weston_pointer *pointer;
 	struct weston_keyboard *keyboard;

src/input.c

@@ -1529,8 +1529,6 @@ weston_seat_init(struct weston_seat *seat, struct weston_compositor *ec)
 {
 	memset(seat, 0, sizeof *seat);
 
-	wl_signal_init(&seat->seat.destroy_signal);
-
 	seat->seat.selection_data_source = NULL;
 	wl_list_init(&seat->seat.base_resource_list);
 	wl_signal_init(&seat->seat.selection_signal);
@@ -1581,8 +1579,6 @@ weston_seat_release(struct weston_seat *seat)
 		xkb_state_unref(seat->xkb_state.state);
 	xkb_info_destroy(&seat->xkb_info);
 
-	wl_signal_emit(&seat->seat.destroy_signal, seat);
-
 	if (seat->seat.pointer)
 		weston_pointer_release(seat->seat.pointer);
 	if (seat->seat.keyboard)

src/shell.c

@@ -471,7 +471,7 @@ focus_state_create(struct weston_seat *seat, struct workspace *ws)
 
 	state->seat_destroy_listener.notify = focus_state_seat_destroy;
 	state->surface_destroy_listener.notify = focus_state_surface_destroy;
-	wl_signal_add(&seat->seat.destroy_signal,
+	wl_signal_add(&seat->destroy_signal,
 		      &state->seat_destroy_listener);
 	wl_list_init(&state->surface_destroy_listener.link);
 

src/text-backend.c

@@ -874,7 +874,7 @@ handle_seat_created(struct wl_listener *listener,
 				      input_method, bind_input_method);
 
 	input_method->destroy_listener.notify = input_method_notifier_destroy;
-	wl_signal_add(&seat->seat.destroy_signal, &input_method->destroy_listener);
+	wl_signal_add(&seat->destroy_signal, &input_method->destroy_listener);
 
 	seat->input_method = input_method;