Fix non-parameterized generic type warning

Change-Id: Ib857166f64420aebf7c31d72825cac44bd770dbd
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/HttpTestCase.java

@@ -117,7 +117,9 @@ public abstract class HttpTestCase extends LocalDiskRepositoryTestCase {
 
 	protected static void fsck(Repository db, RevObject... tips)
 			throws Exception {
-		new TestRepository(db).fsck(tips);
+		TestRepository<? extends Repository> tr =
+				new TestRepository<Repository>(db);
+		tr.fsck(tips);
 	}
 
 	protected static Set<RefSpec> mirror(String... refs) {