mmc: atmel-mci: add missing of_node_put

for_each_child_of_node performs an of_node_get on each
iteration, so a break out of the loop requires an
of_node_put.

This was done using the Coccinelle semantic patch
iterators/for_each_child.cocci
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Link: https://lore.kernel.org/r/20230907095521.14053-6-Julia.Lawall@inria.frSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/atmel-mci.c

@@ -674,8 +674,10 @@ atmci_of_init(struct platform_device *pdev)
 					      "cd", GPIOD_IN, "cd-gpios");
 		err = PTR_ERR_OR_ZERO(pdata->slot[slot_id].detect_pin);
 		if (err) {
-			if (err != -ENOENT)
+			if (err != -ENOENT) {
+				of_node_put(cnp);
 				return ERR_PTR(err);
+			}
 			pdata->slot[slot_id].detect_pin = NULL;
 		}
 
@@ -687,8 +689,10 @@ atmci_of_init(struct platform_device *pdev)
 					      "wp", GPIOD_IN, "wp-gpios");
 		err = PTR_ERR_OR_ZERO(pdata->slot[slot_id].wp_pin);
 		if (err) {
-			if (err != -ENOENT)
+			if (err != -ENOENT) {
+				of_node_put(cnp);
 				return ERR_PTR(err);
+			}
 			pdata->slot[slot_id].wp_pin = NULL;
 		}
 	}