Remove unnecessary statement

Closes gh-4222

spring-boot/src/main/java/org/springframework/boot/bind/PropertySourcesPropertyValues.java

@@ -198,7 +198,6 @@ public class PropertySourcesPropertyValues implements PropertyValues {
 			PropertySource<?> collectionOwner = this.collectionOwners.putIfAbsent(
 					COLLECTION_PROPERTY.matcher(propertyName).replaceAll("[]"), source);
 			if (collectionOwner == null || collectionOwner == source) {
-				this.collectionOwners.get(this.collectionOwners);
 				PropertyValue propertyValue = new OriginCapablePropertyValue(propertyName,
 						value, propertyName, source);
 				this.propertyValues.put(propertyName, propertyValue);