usb: serial: keyspan: fixed coding style issues

fixed coding style issues.
Signed-off-by: NStefan Hubner <s.hubner@tilburguniversity.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/keyspan.c

@@ -298,7 +298,7 @@ static void	usa26_indat_callback(struct urb *urb)
 	endpoint = usb_pipeendpoint(urb->pipe);
 
 	if (status) {
-		dev_dbg(&urb->dev->dev,"%s - nonzero status: %x on endpoint %d.\n",
+		dev_dbg(&urb->dev->dev, "%s - nonzero status: %x on endpoint %d.\n",
 			__func__, status, endpoint);
 		return;
 	}