maple: Unplug top device after all sub-devices

Sometimes, and in particular when using rumble, the top maple device on
a port can get unresponsive for an unknown reason. Instead of
considering it unplugged right away and unregistering it and all its
children devices, unregister it only if all of its sub-devices have
already been detected as unplugged.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

Author: pcercuei

kernel/arch/dreamcast/hardware/maple/maple_irq.c

@@ -131,14 +131,8 @@ static void vbl_autodet_callback(maple_state_t *state, maple_frame_t *frm) {
     if(resp->response == MAPLE_RESPONSE_NONE) {
         /* No device, or not functioning properly; check for removal */
         if(u == 0) {
-            if(dev) {
-                /* Top-level device -- detach all sub-devices as well */
-                for(u = 0; u < MAPLE_UNIT_COUNT; u++) {
-                    vbl_chk_disconnect(state, p, u);
-                }
-
-                dev->dev_mask = 0;
-            }
+            if(dev && dev->dev_mask == 0)
+                vbl_chk_disconnect(state, p, 0);
 
             state->scan_ready_mask |= 1 << p;
         }