USB: input: aiptek.c: fix up dev_err() usage

We should always reference the input device for dev_err(), not the USB
device.  Fix up the places where I got this wrong.
Reported-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Jesper Juhl <jj@chaosbits.net>
CC: JJ Ding <dgdunix@gmail.com>
CC: Edwin van Vliet <edwin@cheatah.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/input/tablet/aiptek.c

@@ -811,7 +811,7 @@ static void aiptek_irq(struct urb *urb)
 exit:
 	retval = usb_submit_urb(urb, GFP_ATOMIC);
 	if (retval != 0) {
-		dev_err(&aiptek->usbdev->dev,
+		dev_err(&inputdev->dev,
 			"%s - usb_submit_urb failed with result %d\n",
 			__func__, retval);
 	}