fix rgb sleep for split kb

tmk_core/protocol/lufa/lufa.c

@@ -855,7 +855,8 @@ void protocol_pre_task(void) {
         dprintln("suspending keyboard");
         while (USB_DeviceState == DEVICE_STATE_Suspended) {
             suspend_power_down();
-            if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
+            const bool wakeup = suspend_wakeup_condition();
+            if (USB_Device_RemoteWakeupEnabled && wakeup) {
                 USB_Device_SendRemoteWakeup();
                 clear_keyboard();