HID: usbhid: no flushing if device is already polled

During open() it is unnecessary to wait for the device to flush
stale inputs if the device is polled while closed due to a quirk
or opening fails.
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

drivers/hid/usbhid/hid-core.c

@@ -710,7 +710,8 @@ int usbhid_open(struct hid_device *hid)
 		 * Wait 50 msec for the queue to empty before allowing events
 		 * to go through hid.
 		 */
-		msleep(50);
+		if (res == 0 && !(hid->quirks & HID_QUIRK_ALWAYS_POLL))
+			msleep(50);
 		clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
 	}
 done: