memory: atmel-ebi: add missing of_node_put for loop iteration

Early exits from for_each_available_child_of_node() should decrement the
node reference counter. Reported by Coccinelle:

drivers/memory/atmel-ebi.c:593:1-33: WARNING:
Function "for_each_available_child_of_node" should have of_node_put() before return around line 604.

Fixes: 6a4ec4cd0888 ("memory: add Atmel EBI (External Bus Interface) driver")
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/memory/atmel-ebi.c

···
 				child);
 
 			ret = atmel_ebi_dev_disable(ebi, child);
-			if (ret)
+			if (ret) {
+				of_node_put(child);
 				return ret;
+			}
 		}
 	}