USB: serial: remove debug parameter from usb_serial_debug_data()

We should use dev_dbg() for usb_serial_debug_data() like all of the rest
of the usb-serial drivers use, so remove the debug parameter as it's not
needed.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index ffbe4ee..a4880d6 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -796,7 +796,7 @@
 	}
 
 	data = urb->transfer_buffer;
-	usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length, data);
+	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 
 	if (urb->actual_length) {
 		tty = tty_port_tty_get(&mos7840_port->port->port);