Fix return reference to local temporary value (#1127)

* Fix invalid return type for temporary variable

core/2d/CCAnchoredSprite.cpp

@@ -200,7 +200,7 @@ void AnchoredSprite::setAnchorPoint(const Vec2& anchor)
     updatePoly();
 }
 
-const Rect& AnchoredSprite::getTouchRect()
+Rect AnchoredSprite::getTouchRect()
 {
     Size s = getContentSize();
     Size a = _spriteVertexAnchor * s;

core/2d/CCAnchoredSprite.h

@@ -140,7 +140,7 @@ public:
     /* This function will reposition the sprite's vertices itself instead of the node */
     virtual void setAnchorPoint(const Vec2& anchor) override;
     /* Gets the hit area of the anchored sprite, this requires special calculations for shifted vertices and should be used with touch event listeners */
-    virtual const Rect& getTouchRect();
+    virtual Rect getTouchRect();
 
 protected:
     virtual void setVertexCoords(const Rect& rect, V3F_C4B_T2F_Quad* outQuad) override;