This fixes the following compile error:
drivers/mtd/nand/rb91x_nand.c: In function 'rb91x_nand_remove':
drivers/mtd/nand/rb91x_nand.c:445:16: error: 'rbni' undeclared (first use in this function)
nand_release(&rbni->chip);
Fixes: 0f07496f520c ("kernel: Update kernel 4.9 to version 4.9.229")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 66e04abbb6d0dec8642be5deb2fca4bba470f8ac)