spi: orion: Add of_node_put() before goto

Fix following coccicheck warning:
./drivers/spi/spi-orion.c:738:1-33: WARNING: Function
for_each_available_child_of_node should have of_node_put() before goto

Early exits from for_each_available_child_of_node should decrement the
node reference counter.
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Link: https://lore.kernel.org/r/20211015034008.6357-1-wanjiabing@vivo.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-orion.c

@@ -769,6 +769,7 @@ static int orion_spi_probe(struct platform_device *pdev)
 		dir_acc->vaddr = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);
 		if (!dir_acc->vaddr) {
 			status = -ENOMEM;
+			of_node_put(np);
 			goto out_rel_axi_clk;
 		}
 		dir_acc->size = PAGE_SIZE;