LockFileTest: Open Git instance in try-with-resource

Change-Id: Ie2b0e55e606f50c46e21227f23de74dbea8388e5
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

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

@@ -61,7 +61,7 @@ public class LockFileTest extends RepositoryTestCase {
 
 	@Test
 	public void lockFailedExceptionRecovery() throws Exception {
-		Git git = new Git(db);
+		try (Git git = new Git(db)) {
 			writeTrashFile("file.txt", "content");
 			git.add().addFilepattern("file.txt").call();
 			RevCommit commit1 = git.commit().setMessage("create file").call();
@@ -82,4 +82,5 @@ public class LockFileTest extends RepositoryTestCase {
 				git.checkout().setName(commit1.name()).call();
 			}
 		}
+	}
 }