ForPathTest: Open TreeWalk in try-with-resource

Change-Id: Ie4d0eb9c0fe1d8b8f41da161e701137cd7dd178f
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/ForPathTest.java

@@ -84,21 +84,22 @@ public class ForPathTest extends RepositoryTestCase {
 			ObjectId tree = tree0.writeTree(oi);
 
 			// Find the directories that were implicitly created above.
-			TreeWalk tw = new TreeWalk(or);
-			tw.addTree(tree);
 			ObjectId a = null;
 			ObjectId aSlashC = null;
-			while (tw.next()) {
-				if (tw.getPathString().equals("a")) {
-					a = tw.getObjectId(0);
-					tw.enterSubtree();
-					while (tw.next()) {
-						if (tw.getPathString().equals("a/c")) {
-							aSlashC = tw.getObjectId(0);
-							break;
+			try (TreeWalk tw = new TreeWalk(or)) {
+				tw.addTree(tree);
+				while (tw.next()) {
+					if (tw.getPathString().equals("a")) {
+						a = tw.getObjectId(0);
+						tw.enterSubtree();
+						while (tw.next()) {
+							if (tw.getPathString().equals("a/c")) {
+								aSlashC = tw.getObjectId(0);
+								break;
+							}
 						}
+						break;
 					}
-					break;
 				}
 			}