Disable bo reuse on shadow framebuffer

This keeps us from trying to set tiling on it while pinned, which also
keeps us from trying to unpin it in the kernel, causing an error.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

src/drmmode_display.c

@@ -489,6 +489,8 @@ drmmode_crtc_shadow_allocate(xf86CrtcPtr crtc, int width, int height)
 		return NULL;
 	}
 
+	drm_intel_bo_disable_reuse(drmmode_crtc->rotate_bo);
+
 	ret = drmModeAddFB(drmmode->fd, width, height, crtc->scrn->depth,
 			   crtc->scrn->bitsPerPixel, rotate_pitch,
 			   drmmode_crtc->rotate_bo->handle,