drm/amdgpu: silence invalid error message

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c

@@ -496,7 +496,7 @@ error_unreserve:
 error_free:
 	drm_free_large(vm_bos);
 
-	if (r)
+	if (r && r != -ERESTARTSYS)
 		DRM_ERROR("Couldn't update BO_VA (%d)\n", r);
 }