mtd: spi-nor: hisi-sfc: fix refcounting bug in hisi_spi_nor_register_all()

mtd: spi-nor: hisi-sfc: fix refcounting bug in hisi_spi_nor_register_all()

This was converted to a _scoped() loop but this of_node_put() was
accidentally left behind which is a double free.

Fixes: aa8cb72c2018 ("mtd: spi-nor: hisi-sfc: Simplify with scoped for each OF child loop")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>