[input] Fix input shutdown order

This fixes another segfault on shutdown (not sure just which recent
change caused it, but the listener pointer needed clearing) but while
fixing the listener issue, I noticed that binding and imt shutdown were
in the wrong order with respect to buttons and axes.

include/QF/input/binding.h

@@ -371,7 +371,6 @@ struct IE_event_s;
 int IN_Binding_HandleEvent (const struct IE_event_s *ie_event);
 void IN_Binding_Activate (void);
 void IN_Binding_Init (void);
-void IN_Binding_Shutdown (void);
 struct plitem_s;
 void IN_Binding_SaveConfig (struct plitem_s *config);
 void IN_Binding_LoadConfig (struct plitem_s *config);

include/QF/input/imt.h

@@ -130,7 +130,6 @@ void IMT_BindButton (imt_t *imt, int button, const char *binding);
 bool IMT_ProcessAxis (int axis, int value);
 bool IMT_ProcessButton (int button, int state);
 void IMT_Init (void);
-void IMT_Shutdown (void);
 struct plitem_s;
 void IMT_SaveConfig (struct plitem_s *config);
 void IMT_SaveAxisConfig (struct plitem_s *axes, int axis_ind, int dev_axis);

libs/input/in_binding.c

@@ -778,19 +778,8 @@ IN_Binding_Activate (void)
 	IE_Set_Focus (in_binding_handler);
 }
 
-void
-IN_Binding_Init (void)
-{
-	in_binding_handler = IE_Add_Handler (in_binding_event_handler, 0);
-	in_keyhelp_handler = IE_Add_Handler (in_keyhelp_event_handler, 0);
-
-	for (bindcmd_t *cmd = in_binding_commands; cmd->name; cmd++) {
-		Cmd_AddCommand (cmd->name, cmd->func, cmd->desc);
-	}
-}
-
-void
-IN_Binding_Shutdown ()
+static void
+IN_Binding_Shutdown (void *data)
 {
 	for (in_devbindings_t *db = devbindings_list; db; db = db->next) {
 		clear_connection (db);
@@ -802,6 +791,18 @@ IN_Binding_Shutdown ()
 	DARRAY_CLEAR (&known_devices);
 }
 
+void
+IN_Binding_Init (void)
+{
+	Sys_RegisterShutdown (IN_Binding_Shutdown, 0);
+	in_binding_handler = IE_Add_Handler (in_binding_event_handler, 0);
+	in_keyhelp_handler = IE_Add_Handler (in_keyhelp_event_handler, 0);
+
+	for (bindcmd_t *cmd = in_binding_commands; cmd->name; cmd++) {
+		Cmd_AddCommand (cmd->name, cmd->func, cmd->desc);
+	}
+}
+
 void
 IN_Binding_SaveConfig (plitem_t *config)
 {

libs/input/in_button.c

@@ -69,6 +69,7 @@ button_free (void *b, void *data)
 	if (rb->button->listeners) {
 		DARRAY_CLEAR (rb->button->listeners);
 		free (rb->button->listeners);
+		rb->button->listeners = 0;
 	}
 	free (rb);
 }

libs/input/in_common.c

@@ -532,15 +532,13 @@ IN_shutdown (void *data)
 {
 	//JOY_Shutdown ();
 
-	Sys_MaskPrintf (SYS_vid, "IN_Shutdown\n");
+	Sys_MaskPrintf (SYS_vid, "IN_shutdown\n");
 	for (size_t i = in_drivers.size; i-- > 0; ) {
 		in_regdriver_t *rd = &in_drivers.a[i];
 		if (rd->driver.shutdown) {
 			rd->driver.shutdown (rd->data);
 		}
 	}
-	IN_Binding_Shutdown ();
-	IMT_Shutdown ();
 
 	DARRAY_CLEAR (&in_drivers);
 	DARRAY_CLEAR (&in_devices);

libs/input/in_imt.c

@@ -936,19 +936,8 @@ static imtcmd_t imt_commands[] = {
 	{},
 };
 
-void
-IMT_Init (void)
-{
-	binding_mem = new_memsuper ();
-	recipe_tab = Hash_NewTable (61, 0, recipe_free, 0, 0);
-	Hash_SetHashCompare (recipe_tab, recipe_get_hash, recipe_compare);
-	for (imtcmd_t *cmd = imt_commands; cmd->name; cmd++) {
-		Cmd_AddCommand (cmd->name, cmd->func, cmd->desc);
-	}
-}
-
-void
-IMT_Shutdown (void)
+static void
+IMT_Shutdown (void *data)
 {
 	imt_drop_all_f ();
 	Hash_DelTable (recipe_tab);
@@ -960,6 +949,18 @@ IMT_Shutdown (void)
 	DARRAY_CLEAR (&in_contexts);
 }
 
+void
+IMT_Init (void)
+{
+	Sys_RegisterShutdown (IMT_Shutdown, 0);
+	binding_mem = new_memsuper ();
+	recipe_tab = Hash_NewTable (61, 0, recipe_free, 0, 0);
+	Hash_SetHashCompare (recipe_tab, recipe_get_hash, recipe_compare);
+	for (imtcmd_t *cmd = imt_commands; cmd->name; cmd++) {
+		Cmd_AddCommand (cmd->name, cmd->func, cmd->desc);
+	}
+}
+
 void
 IMT_SaveConfig (plitem_t *config)
 {