[MTD] [OneNAND] Fix wrong free the static address in onenand_sim

Reported-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

drivers/mtd/onenand/onenand_sim.c

@@ -425,7 +425,6 @@ static void flash_exit(struct onenand_flash *flash)
 {
 	vfree(ONENAND_CORE(flash));
 	kfree(flash->base);
-	kfree(flash);
 }
 
 static int __init onenand_sim_init(void)