drm/vmgfx: operation on ‘par->dirty.y1’ may be undefined

Trivial fix to set y1 = y2 = 0.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index b0866f04e..870967a 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -528,7 +528,7 @@
 	 * Dirty & Deferred IO
 	 */
 	par->dirty.x1 = par->dirty.x2 = 0;
-	par->dirty.y1 = par->dirty.y1 = 0;
+	par->dirty.y1 = par->dirty.y2 = 0;
 	par->dirty.active = true;
 	spin_lock_init(&par->dirty.lock);
 	info->fbdefio = &vmw_defio;