[gnome-nibbles] Fix minor style issue

[Iulian Radu <iulianradu src gnome org>]

commit 58066ce1005b4ba20f372604c3424940ecb14e6f
Author: Iulian Radu <iulian radu67 gmail com>
Date:   Thu Mar 3 22:52:48 2016 +0200

    Fix minor style issue

 src/nibbles-game.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/nibbles-game.vala b/src/nibbles-game.vala
index efb6bd1..08a9f27 100644
--- a/src/nibbles-game.vala
+++ b/src/nibbles-game.vala
@@ -441,7 +441,7 @@ public class NibblesGame : Object
                 {
                     worm.score += ((worm.length + worm.change / 2) * current_level);
                     worm.reduce_tail (board, worm.length / 2);
-                    worm.change -= (worm.length + worm.change) /2;
+                    worm.change -= (worm.length + worm.change) / 2;
                 }
                 break;
             case BonusType.LIFE: