xfree86: vgaarb: missing wrapping macro

Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>

hw/xfree86/common/xf86VGAarbiter.c

@@ -181,7 +181,9 @@ xf86VGAarbiterWrapFunctions(void)
 
     for (i = 0; i < xf86NumScreens; i++) {
         pScreen = xf86Screens[i]->pScreen;
+#ifdef RENDER
         ps = GetPictureScreenIfSet(pScreen);
+#endif
         pScrn = xf86Screens[pScreen->myNum];
         PointPriv = dixLookupPrivate(&pScreen->devPrivates, miPointerScreenKey);