Input: cm109 - remove needless check before usb_free_coherent()

usb_free_coherent() is safe with NULL addr and this check is
not required.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/r/20200707030905.3123-1-vulab@iscas.ac.cnSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/cm109.c

@@ -663,12 +663,8 @@ static const struct usb_device_id cm109_usb_table[] = {
 static void cm109_usb_cleanup(struct cm109_dev *dev)
 {
 	kfree(dev->ctl_req);
-	if (dev->ctl_data)
-		usb_free_coherent(dev->udev, USB_PKT_LEN,
-				  dev->ctl_data, dev->ctl_dma);
-	if (dev->irq_data)
-		usb_free_coherent(dev->udev, USB_PKT_LEN,
-				  dev->irq_data, dev->irq_dma);
+	usb_free_coherent(dev->udev, USB_PKT_LEN, dev->ctl_data, dev->ctl_dma);
+	usb_free_coherent(dev->udev, USB_PKT_LEN, dev->irq_data, dev->irq_dma);
 
 	usb_free_urb(dev->urb_irq);	/* parameter validation in core/urb */
 	usb_free_urb(dev->urb_ctl);	/* parameter validation in core/urb */