GC: Remove redundant type arguments

Signed-off-by: Hector Oswaldo Caballero <hector.caballero@ericsson.com>
Change-Id: Id3281a744b08f9d7b2b60f69b4e461b053ac5d02

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java

@@ -313,7 +313,7 @@ public class GC {
 		packRefs();
 		// TODO: implement reflog_expire(pm, repo);
 		Collection<PackFile> newPacks = repack();
-		prune(Collections.<ObjectId> emptySet());
+		prune(Collections.emptySet());
 		// TODO: implement rerere_gc(pm);
 		return newPacks;
 	}
@@ -999,7 +999,7 @@ public class GC {
 		List<ReflogEntry> rlEntries = reflogReader
 				.getReverseEntries();
 		if (rlEntries == null || rlEntries.isEmpty())
-			return Collections.<ObjectId> emptySet();
+			return Collections.emptySet();
 		Set<ObjectId> ret = new HashSet<>();
 		for (ReflogEntry e : rlEntries) {
 			if (e.getWho().getWhen().getTime() < minTime)