Use try-with-resource to close resources in BundleFetchConnection

Change-Id: Id79c01133b835e278d5b494b5bc5972d7aeed9a9
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java

@@ -183,16 +183,13 @@ class BundleFetchConnection extends BaseFetchConnection {
 			throws TransportException {
 		verifyPrerequisites();
 		try {
-			ObjectInserter ins = transport.local.newObjectInserter();
-			try {
+			try (ObjectInserter ins = transport.local.newObjectInserter()) {
 				PackParser parser = ins.newPackParser(bin);
 				parser.setAllowThin(true);
 				parser.setObjectChecker(transport.getObjectChecker());
 				parser.setLockMessage(lockMessage);
 				packLock = parser.parse(NullProgressMonitor.INSTANCE);
 				ins.flush();
-			} finally {
-				ins.release();
 			}
 		} catch (IOException err) {
 			close();
@@ -217,8 +214,7 @@ class BundleFetchConnection extends BaseFetchConnection {
 		if (prereqs.isEmpty())
 			return;
 
-		final RevWalk rw = new RevWalk(transport.local);
-		try {
+		try (final RevWalk rw = new RevWalk(transport.local)) {
 			final RevFlag PREREQ = rw.newFlag("PREREQ"); //$NON-NLS-1$
 			final RevFlag SEEN = rw.newFlag("SEEN"); //$NON-NLS-1$
 
@@ -281,8 +277,6 @@ class BundleFetchConnection extends BaseFetchConnection {
 				throw new MissingBundlePrerequisiteException(transport.uri,
 						missing);
 			}
-		} finally {
-			rw.release();
 		}
 	}