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/include/linux/usb/serial.h b/include/linux/usb/serial.h
index e71bc5e..b2b6d15 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -355,14 +355,12 @@
 extern struct bus_type usb_serial_bus_type;
 extern struct tty_driver *usb_serial_tty_driver;
 
-static inline void usb_serial_debug_data(int debug,
-					 struct device *dev,
+static inline void usb_serial_debug_data(struct device *dev,
 					 const char *function, int size,
 					 const unsigned char *data)
 {
-	if (debug)
-		dev_printk(KERN_DEBUG, dev, "%s - length = %d, data = %*ph\n",
-			   function, size, size, data);
+	dev_dbg(dev, "%s - length = %d, data = %*ph\n",
+		function, size, size, data);
 }
 
 /*