mtd: rawnand: oxnas: Add of_node_put()

[ Upstream commit c436f68beeb20f2f92937677db1d9069b0dd2a3d ]

Each iteration of for_each_child_of_node puts the previous node, but in
the case of a goto from the middle of the loop, there is no put, thus
causing a memory leak. Hence add an of_node_put under a new goto to put
the node at a loop exit.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>