Fix checkstyle

Issue gh-3736

Author: Rob Winch

core/src/main/java/org/springframework/security/jackson2/UserDeserializer.java

@@ -65,7 +65,7 @@ public User deserialize(JsonParser jp, DeserializationContext ctxt) throws IOExc
 				readJsonNode(jsonNode, "credentialsNonExpired").asBoolean(),
 				readJsonNode(jsonNode, "accountNonLocked").asBoolean(), authorities
 		);
-		
+
 		if(password.asText(null) == null) {
 			result.eraseCredentials();
 		}