Use try-with-resources in Avro tests

Author: Fokko

presto-product-tests/src/main/java/io/prestosql/tests/kafka/KafkaAvroSmokeTest.java

@@ -110,7 +110,6 @@ private static byte[] convertRecordToAvro(Schema schema, Map<String, Object> val
         try (DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<>(new GenericDatumWriter<>(schema))) {
             dataFileWriter.create(schema, outputStream);
             dataFileWriter.append(record);
-            dataFileWriter.close();
         }
         catch (IOException e) {
             throw new UncheckedIOException("Failed to convert to Avro.", e);

presto-record-decoder/src/test/java/io/prestosql/decoder/avro/TestAvroDecoder.java

@@ -146,12 +146,9 @@ private static GenericData.Record buildAvroRecord(Schema schema, ByteArrayOutput
     {
         GenericData.Record record = new GenericData.Record(schema);
         values.forEach(record::put);
-        try {
-            DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<>(new GenericDatumWriter<>(schema));
-
+        try (DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<>(new GenericDatumWriter<>(schema))) {
             dataFileWriter.create(schema, outputStream);
             dataFileWriter.append(record);
-            dataFileWriter.close();
         }
         catch (IOException e) {
             throw new RuntimeException("Failed to convert to Avro.", e);