GH-3917: Fix CommonMixedErrorHandler ctor for proper validation

Fixes: #3917
Issue link: #3917

* Fixed a null check issue in the constructor of `CommonMixedErrorHandler`

Signed-off-by: JaeYeon Kim <[email protected]>

**Auto-cherry-pick to `3.3.x` & `3.2.x`**

Author: ghgh415263

spring-kafka/src/main/java/org/springframework/kafka/listener/CommonMixedErrorHandler.java

@@ -30,6 +30,7 @@
  * for record and batch listeners.
  *
  * @author Gary Russell
+ * @author JaeYeon Kim
  * @since 2.8
  *
  */
@@ -46,7 +47,7 @@ public class CommonMixedErrorHandler implements CommonErrorHandler {
 	 */
 	public CommonMixedErrorHandler(CommonErrorHandler recordErrorHandler, CommonErrorHandler batchErrorHandler) {
 		Assert.notNull(recordErrorHandler, "'recordErrorHandler' cannot be null");
-		Assert.notNull(recordErrorHandler, "'batchErrorHandler' cannot be null");
+		Assert.notNull(batchErrorHandler, "'batchErrorHandler' cannot be null");
 		this.recordErrorHandler = recordErrorHandler;
 		this.batchErrorHandler = batchErrorHandler;
 	}