Use try-with-resource to close resources in CloneCommand

Change-Id: I9536bc208a5f3ec34f0a82fb565b4253be38e074
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/CloneCommand.java

@@ -322,12 +322,9 @@ public class CloneCommand extends TransportCommand<CloneCommand, Git> {
 	private RevCommit parseCommit(final Repository clonedRepo, final Ref ref)
 			throws MissingObjectException, IncorrectObjectTypeException,
 			IOException {
-		final RevWalk rw = new RevWalk(clonedRepo);
 		final RevCommit commit;
-		try {
+		try (final RevWalk rw = new RevWalk(clonedRepo)) {
 			commit = rw.parseCommit(ref.getObjectId());
-		} finally {
-			rw.release();
 		}
 		return commit;
 	}