[mutter/wip/carlosg/grabs-pt2] clutter: Move priv variable initialization after precondition checks

[Carlos Garnacho <carlosg src gnome org>]

commit c5d2a78f6c418ecfba95797b1b015cb02586ede8
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Jan 16 18:00:35 2022 +0100

    clutter: Move priv variable initialization after precondition checks
    
    In case of misuse (e.g. passing NULL stage) this might result in crashes
    before the precondition checks managed to kick in. Move this priv variable
    initialization after these checks.

 clutter/clutter/clutter-stage.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index c68d636878..b215f69982 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -3778,12 +3778,14 @@ ClutterGrab *
 clutter_stage_grab (ClutterStage *stage,
                     ClutterActor *actor)
 {
-  ClutterStagePrivate *priv = stage->priv;
+  ClutterStagePrivate *priv;
   ClutterGrab *grab;
 
   g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL);
   g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), NULL);
 
+  priv = stage->priv;
+
   if (!priv->topmost_grab)
     {
       ClutterMainContext *context;