Use Map.getOrDefault in getSqlType implementation

Issue: SPR-15238

Author: jhoeller

spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/AbstractSqlParameterSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -64,11 +64,7 @@ public void registerTypeName(String paramName, String typeName) {
 	@Override
 	public int getSqlType(String paramName) {
 		Assert.notNull(paramName, "Parameter name must not be null");
-		Integer sqlType = this.sqlTypes.get(paramName);
-		if (sqlType != null) {
-			return sqlType;
-		}
-		return TYPE_UNKNOWN;
+		return this.sqlTypes.getOrDefault(paramName, TYPE_UNKNOWN);
 	}
 
 	/**