USB: Serial: kobil_sct.c: remove debug module parameter

Now that all usb-serial modules are only using dev_dbg()
the debug module parameter does not do anything at all, so
remove it to reduce any confusion if someone were to try to
use it.

CC: Johan Hovold <jhovold@gmail.com>
CC: Alan Stern <stern@rowland.harvard.edu>
CC: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/kobil_sct.c

@@ -38,8 +38,6 @@
 #include <linux/ioctl.h>
 #include "kobil_sct.h"
 
-static bool debug;
-
 /* Version Information */
 #define DRIVER_VERSION "21/05/2004"
 #define DRIVER_AUTHOR "KOBIL Systems GmbH - http://www.kobil.com"
@@ -659,6 +657,3 @@ module_usb_serial_driver(serial_drivers, id_table);
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
-
-module_param(debug, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(debug, "Debug enabled or not");