ReflogReaderTest: Open FileOutputStream in try-with-resource

Change-Id: I09af22292cc4b615b40a820dbc054282bb0c76b8
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogReaderTest.java

@@ -277,11 +277,8 @@ public class ReflogReaderTest extends SampleDataRepositoryTestCase {
 					"oops, cannot create the directory for the test reflog file"
 							+ logfile);
 		}
-		FileOutputStream fileOutputStream = new FileOutputStream(logfile);
-		try {
+		try (FileOutputStream fileOutputStream = new FileOutputStream(logfile)) {
 			fileOutputStream.write(data);
-		} finally {
-			fileOutputStream.close();
 		}
 	}