drivers/char/rio/rioctrl.c: off by one error in rioctrl.c

If DownLoad.ProductCode == MAX_PRODUCT, that would be a problem when we do
RIOBootTable[DownLoad.ProductCode] a couple lines down.

Found by smatch (http://repo.or.cz/w/smatch.git).
Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/rio/rioctrl.c

@@ -873,7 +873,7 @@ int riocontrol(struct rio_info *p, dev_t dev, int cmd, unsigned long arg, int su
 		/*
 		 ** It is important that the product code is an unsigned object!
 		 */
-		if (DownLoad.ProductCode > MAX_PRODUCT) {
+		if (DownLoad.ProductCode >= MAX_PRODUCT) {
 			rio_dprintk(RIO_DEBUG_CTRL, "RIO_DOWNLOAD: Bad product code %d passed\n", DownLoad.ProductCode);
 			p->RIOError.Error = NO_SUCH_PRODUCT;
 			return -ENXIO;