cafe_nand: Fix warning

Wrong types on IRQ handler
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/mtd/nand/cafe_nand.c

@@ -332,7 +332,7 @@ static void cafe_select_chip(struct mtd_info *mtd, int chipnr)
 		cafe->ctl1 &= ~CTRL1_CHIPSELECT;
 }
 
-static int cafe_nand_interrupt(int irq, void *id)
+static irqreturn_t cafe_nand_interrupt(int irq, void *id)
 {
 	struct mtd_info *mtd = id;
 	struct cafe_priv *cafe = mtd->priv;