qxl: Mark some internal functions as static

They are not used outside of their respective source file

Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>
Message-id: 20161108091209.25568-2-cfergeau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/drivers/gpu/drm/qxl/qxl_cmd.c b/drivers/gpu/drm/qxl/qxl_cmd.c
index 04270f5..74fc936 100644
--- a/drivers/gpu/drm/qxl/qxl_cmd.c
+++ b/drivers/gpu/drm/qxl/qxl_cmd.c
@@ -578,7 +578,7 @@ int qxl_hw_surface_dealloc(struct qxl_device *qdev,
 	return 0;
 }
 
-int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf)
+static int qxl_update_surface(struct qxl_device *qdev, struct qxl_bo *surf)
 {
 	struct qxl_rect rect;
 	int ret;