mediatek: mt76: eeprom: fix missing of_node_put() in mt76_find_power_limits_node()

We should use of_node_put() for the reference 'np' returned by
of_get_child_by_name() which will increase the refcount.

Fixes: 22b980ba ("mt76: add functions for parsing rate power limits from DT")
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/eeprom.c

@@ -162,10 +162,13 @@ mt76_find_power_limits_node(struct mt76_dev *dev)
 		}
 
 		if (mt76_string_prop_find(country, dev->alpha2) ||
-		    mt76_string_prop_find(regd, region_name))
+		    mt76_string_prop_find(regd, region_name)) {
+			of_node_put(np);
 			return cur;
+		}
 	}
 
+	of_node_put(np);
 	return fallback;
 }