fbdev/atyfb: fix recent breakage in correct_chipset()

The 6e36308a6f "fb: fix atyfb build warning" isn't right. It makes all
the indexes off by one. This patch reverts it and casts the
ARRAY_SIZE() to int to silence the build warning.

Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>

drivers/video/aty/atyfb_base.c

···
 	const char *name;
 	int i;
 
-	for (i = ARRAY_SIZE(aty_chips); i > 0; i--)
-		if (par->pci_id == aty_chips[i - 1].pci_id)
+	for (i = (int)ARRAY_SIZE(aty_chips) - 1; i >= 0; i--)
+		if (par->pci_id == aty_chips[i].pci_id)
 			break;
 
 	if (i < 0)