Fix ObjectReader resources leak

In 77030a5e, AutoClosable was implemented on classes that use release().
This caused a resource leak because the ObjectReader.close method  was
not calling the now deprecated release method, which is the method that
sub classes implements to release resources.

Change-Id: I247651ec8fd7ca9941d256ca46d14cc43cc35c6e
Signed-off-by: Hugo Arès <hugo.ares@ericsson.com>

org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectReader.java

@@ -429,7 +429,7 @@ public BitmapIndex getBitmapIndex() throws IOException {
 	 */
 	@Deprecated
 	public void release() {
-		close();
+		// Do nothing.
 	}
 
 	/**
@@ -442,6 +442,6 @@ public void release() {
 	 */
 	@Override
 	public void close() {
-		// Do nothing.
+		release();
 	}
 }