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wayland/surface: Only call destroy func when available

Georges Basile Stavracas Neto requested to merge gbsneto/fix-wayland-export-handle into master

When calling gdk_wayland_surface_export_handle(), if we pass some 'user_data' but no 'destroy_func', GTK4 crashes. That's because in xdg_exported_handle() we are unconditionally calling destroy_func -- even when it's NULL.

Fix that by checking if there's a destroy function before calling it.

Fixes #2179 (closed)

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