mtd: cfi_cmdset_0002: Fix do_erase_chip() to get chip as erasing mode

The chip state is set to erasing by the function after getting chip.
So it should be to get chip as erasing mode at first.
But previously it was to get chip as writing mode then fix as erasing.
Signed-off-by: NTokunori Ikegami <ikegami.t@gmail.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: NRichard Weinberger <richard@nod.at>

drivers/mtd/chips/cfi_cmdset_0002.c

@@ -2417,7 +2417,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
 	adr = cfi->addr_unlock1;
 
 	mutex_lock(&chip->mutex);
-	ret = get_chip(map, chip, adr, FL_WRITING);
+	ret = get_chip(map, chip, adr, FL_ERASING);
 	if (ret) {
 		mutex_unlock(&chip->mutex);
 		return ret;