SquashMessageFormatterTest: Open git in try-with-resource

Change-Id: Ife94d1f0279ed3671a9bca79fb26c0403549fa17
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/SquashMessageFormatterTest.java

@@ -73,7 +73,7 @@ public class SquashMessageFormatterTest extends SampleDataRepositoryTestCase {
 
 	@Test
 	public void testCommit() throws Exception {
-		Git git = new Git(db);
+		try (Git git = new Git(db)) {
 			revCommit = git.commit().setMessage("squash_me").call();
 
 			Ref master = db.exactRef("refs/heads/master");
@@ -87,3 +87,4 @@ public class SquashMessageFormatterTest extends SampleDataRepositoryTestCase {
 							+ "\n\n\tsquash_me\n", message);
 		}
 	}
+}