[gtksourceview] assistant: fix compilation warning

[Christian Hergert <chergert src gnome org>]

commit 02926e9e8f52ca438fc8d2af4281830224cc1daa
Author: Christian Hergert <chergert redhat com>
Date:   Thu Sep 1 13:29:17 2022 -0700

    assistant: fix compilation warning

 gtksourceview/gtksourceassistant.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gtksourceview/gtksourceassistant.c b/gtksourceview/gtksourceassistant.c
index 0ef889b7..df5890f8 100644
--- a/gtksourceview/gtksourceassistant.c
+++ b/gtksourceview/gtksourceassistant.c
@@ -167,11 +167,10 @@ gtk_source_assistant_reposition_tick_cb (GtkWidget     *widget,
                                          GdkFrameClock *frame_clock,
                                          gpointer       user_data)
 {
-       GtkSourceView *view = (GtkSourceView *)widget;
        GtkSourceAssistant *self = user_data;
        GtkSourceAssistantPrivate *priv = _gtk_source_assistant_get_instance_private (self);
 
-       g_assert (GTK_SOURCE_IS_VIEW (view));
+       g_assert (GTK_SOURCE_IS_VIEW (widget));
        g_assert (GDK_IS_FRAME_CLOCK (frame_clock));
        g_assert (GTK_SOURCE_IS_ASSISTANT (self));