hid: fix incorrect return value for hid

The return value of hid_keyboard_write is used to set the packet's actual_length
and pass to xhci directly to allow guest know how many byte actually processed.
Therefore, return 1 to indicate a successful transfer or it will be
considered as a wrong xfer.

Signed-off-by: ShengYi Hung <aokblast@FreeBSD.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/input/hid.c

@@ -478,6 +478,7 @@ int hid_keyboard_write(HIDState *hs, uint8_t *buf, int len)
             ledstate |= QEMU_CAPS_LOCK_LED;
         }
         kbd_put_ledstate(ledstate);
+        return 1;
     }
     return 0;
 }