USB: serial: export symbol usb_serial_generic_disconnect

This is needed by the ssu100 driver to use this function.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/generic.c

@@ -518,6 +518,7 @@ void usb_serial_generic_disconnect(struct usb_serial *serial)
 	for (i = 0; i < serial->num_ports; ++i)
 		generic_cleanup(serial->port[i]);
 }
+EXPORT_SYMBOL_GPL(usb_serial_generic_disconnect);
 
 void usb_serial_generic_release(struct usb_serial *serial)
 {