Fixed a couple of warnings, including one reported by curaga (3472442)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4035 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CGUICheckBox.cpp

@@ -129,7 +129,6 @@ void CGUICheckBox::draw()
 	IGUISkin* skin = Environment->getSkin();
 	if (skin)
 	{
-		const core::rect<s32> rect = AbsoluteRect;
 		const s32 height = skin->getSize(EGDS_CHECK_BOX_WIDTH);
 
 		core::rect<s32> checkRect(AbsoluteRect.UpperLeftCorner.X,

source/Irrlicht/CGUITreeView.cpp

@@ -696,7 +696,7 @@ void CGUITreeView::mouseAction( s32 xpos, s32 ypos, bool onlyHover /*= false*/ )
 {
 	IGUITreeViewNode*		oldSelected = Selected;
 	IGUITreeViewNode*		hitNode = 0;
-	s32						selIdx;
+	s32						selIdx=-1;
 	s32						n;
 	IGUITreeViewNode*		node;
 	SEvent					event;