adb: fix read reg 3 byte ordering

According to the Apple ADB documentation, register 3 is a 2-byte register
with the device address in the first byte, and the handler ID in the second
byte.

This is currently the opposite away to which QEMU returns them so switch the
order around.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/input/adb-kbd.c

@@ -290,8 +290,8 @@ static int adb_kbd_request(ADBDevice *d, uint8_t *obuf,
             olen = 2;
             break;
         case 3:
-            obuf[0] = d->handler;
-            obuf[1] = d->devaddr;
+            obuf[0] = d->devaddr;
+            obuf[1] = d->handler;
             olen = 2;
             break;
         }

hw/input/adb-mouse.c

@@ -172,8 +172,8 @@ static int adb_mouse_request(ADBDevice *d, uint8_t *obuf,
         case 1:
             break;
         case 3:
-            obuf[0] = d->handler;
-            obuf[1] = d->devaddr;
+            obuf[0] = d->devaddr;
+            obuf[1] = d->handler;
             olen = 2;
             break;
         }