[libadwaita] carousel: Better check the child is correct in remove()

[Alexander Mikhaylenko <alexm src gnome org>]

commit 8e7ef84a9ff14a26ca0a3d2c437c80840c12bd34
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri May 21 08:03:21 2021 +0200

    carousel: Better check the child is correct in remove()
    
    Now that there isn't AdwCarouselBox anymore, we can directly check if
    the child belongs to the carousel.

 src/adw-carousel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/adw-carousel.c b/src/adw-carousel.c
index 1013abd8..9d5cb76b 100644
--- a/src/adw-carousel.c
+++ b/src/adw-carousel.c
@@ -1320,11 +1320,11 @@ adw_carousel_remove (AdwCarousel *self,
 
   g_return_if_fail (ADW_IS_CAROUSEL (self));
   g_return_if_fail (GTK_IS_WIDGET (child));
+  g_return_if_fail (gtk_widget_get_parent (child) == GTK_WIDGET (self));
 
   info = find_child_info (self, child);
 
-  if (!info)
-    return;
+  g_assert_nonnull (info);
 
   info->removing = TRUE;