drm/vmwgfx: Always evict vram _before_ disabling it

Other way round is a bit inconsistent (but not buggy in any kind).
This is prep work so that ttm_resource_manager_set_used can assert
that the resource manager is empty.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201211162942.3399050-2-daniel.vetter@ffwll.ch

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -1254,9 +1254,9 @@ void vmw_svga_disable(struct vmw_private *dev_priv)
 	vmw_kms_lost_device(&dev_priv->drm);
 	ttm_write_lock(&dev_priv->reservation_sem, false);
 	if (ttm_resource_manager_used(man)) {
-		ttm_resource_manager_set_used(man, false);
 		if (ttm_resource_manager_evict_all(&dev_priv->bdev, man))
 			DRM_ERROR("Failed evicting VRAM buffers.\n");
+		ttm_resource_manager_set_used(man, false);
 		vmw_write(dev_priv, SVGA_REG_ENABLE,
 			  SVGA_REG_ENABLE_HIDE |
 			  SVGA_REG_ENABLE_ENABLE);