USB: drivers/usb/misc/sisusbvga/sisusb.c: kill two unused variables

Kill two unused variables in drivers/usb/misc/sisusbvga/sisusb.c.
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/misc/sisusbvga/sisusb.c

@@ -3316,8 +3316,6 @@ static struct usb_driver sisusb_driver = {
 
 static int __init usb_sisusb_init(void)
 {
-	int retval;
-	struct sisusb_usb_data *sisusb;
 
 #ifdef INCL_SISUSB_CON
 	sisusb_init_concode();