mted: nand_wait_ready timeout fix

nand_wait_ready timeout should not assume HZ=100.
Make it independent of HZ value by using msecs_to_jiffies.
Signed-off-by: Matthieu CASTET <matthieu.castet@parrot.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

drivers/mtd/nand/nand_base.c

@@ -490,7 +490,7 @@ static void panic_nand_wait_ready(struct mtd_info *mtd, unsigned long timeo)
 void nand_wait_ready(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
-	unsigned long timeo = jiffies + 2;
+	unsigned long timeo = jiffies + msecs_to_jiffies(20);
 
 	/* 400ms timeout */
 	if (in_interrupt() || oops_in_progress)