DirCacheIterator: Open InputStream in try-with-resource

Change-Id: I05d2d1de9a3d39466a6880f6e8107da8681876b1
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheIterator.java

@@ -329,11 +329,8 @@ public class DirCacheIterator extends AbstractTreeIterator {
 			AttributesNode r = new AttributesNode();
 			ObjectLoader loader = reader.open(objectId);
 			if (loader != null) {
-				InputStream in = loader.openStream();
-				try {
+				try (InputStream in = loader.openStream()) {
 					r.parse(in);
-				} finally {
-					in.close();
 				}
 			}
 			return r.getRules().isEmpty() ? null : r;