Fix returned item count algorithm

internal/graphql/resolver/query.resolvers.go

@@ -27,7 +27,7 @@ func (r *queryResolver) Playlist(ctx context.Context, first int, after *model.Cu
 	playlist := r.PlaylistProvider.Playlist()
 	count := 0
 	var item *playlist2.ListItem = nil
-	for item = playlist.Start(); item != nil && count < first; item = item.Next() {
+	for item = playlist.Start(); item != nil && first > 1; item = item.Next() {
 		if count > start {
 			result = append(result, model.PlaylistEdge{
 				Cursor: model.MakeCursor("PlaylistItem", count),
@@ -38,6 +38,7 @@ func (r *queryResolver) Playlist(ctx context.Context, first int, after *model.Cu
 			})
 		}
 		count++
+		first--
 	}
 	return &model.PlaylistConnection{
 		ID: fmt.Sprintf("%d:%d", start+1, count-1),