Must call ValidateGC in i830_uxa_put_image for scratch GC

Always need to call ValidateGC or the scratch GC will not get the
right composite clip.

Signed-off-by: Keith Packard <keithp@keithp.com>

src/i830_uxa.c

@@ -862,6 +862,7 @@ static Bool i830_uxa_put_image(PixmapPtr pixmap,
 			if (scratch) {
 				gc = GetScratchGC(pixmap->drawable.depth, screen);
 				if (gc) {
+					ValidateGC(&pixmap->drawable, gc);
 					pixmap->devPrivate.ptr = priv->bo->virtual;
 					ret = !! fbCopyArea(&scratch->drawable, &pixmap->drawable, gc,
 							    0, 0,