mmc: cavium-octeon: Add of_node_put() when breaking out of loop

In octeon_mmc_probe(), we should call of_node_put() when breaking
out of for_each_child_of_node() which has increased and decreased
the refcount during each iteration.

Fixes: 01d95843 ("mmc: cavium: Add MMC support for Octeon SOCs.")
Signed-off-by: NLiang He <windhl@126.com>
Acked-by: NRobert Richter <rric@kernel.org>
Link: https://lore.kernel.org/r/20220719095216.1241601-1-windhl@126.comSigned-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/cavium-octeon.c

@@ -277,6 +277,7 @@ static int octeon_mmc_probe(struct platform_device *pdev)
 		if (ret) {
 			dev_err(&pdev->dev, "Error populating slots\n");
 			octeon_mmc_set_shared_power(host, 0);
+			of_node_put(cn);
 			goto error;
 		}
 		i++;