Input: atkbd - fix overrun in atkbd_set_repeat_rate()

This was introduced in commit 3d0f0fa0:
bounds checking is performed against period[32] while indexing delay[4].

Spotted by Coverity, CID 1376.
Signed-off-by: Florin Malita <fmalita@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/keyboard/atkbd.c

@@ -498,7 +498,7 @@ static int atkbd_set_repeat_rate(struct atkbd *atkbd)
 		i++;
 	dev->rep[REP_PERIOD] = period[i];
 
-	while (j < ARRAY_SIZE(period) - 1 && delay[j] < dev->rep[REP_DELAY])
+	while (j < ARRAY_SIZE(delay) - 1 && delay[j] < dev->rep[REP_DELAY])
 		j++;
 	dev->rep[REP_DELAY] = delay[j];