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: Alan Stern <stern@rowland.harvard.edu> CC: "Bjørn Mork" <bjorn@mork.no> CC: Rusty Russell <rusty@rustcorp.com.au> CC: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>