[devhelp/fix-warnings] Fix compiler warning

[Emmanuele Bassi <ebassi src gnome org>]

commit c830a66ce3c188aa18a3c9cbbbc87b7b013f639e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Apr 12 18:11:01 2021 +0100

    Fix compiler warning
    
    The revert in 1d5c8da15ab7fbff9b568630c5892fddce8cb44c generated two
    compiler warnings, so let's get rid of those.

 src/dh-window.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/dh-window.c b/src/dh-window.c
index f29d5d62..e09334b3 100644
--- a/src/dh-window.c
+++ b/src/dh-window.c
@@ -243,8 +243,8 @@ close_tab_cb (GSimpleAction *action,
          * what gedit does, or other GNOME apps with a GtkNotebook plus Ctrl+W
          * shortcut, and do the same.
          */
-        page_num = gtk_notebook_get_current_page (priv->notebook);
-        gtk_notebook_remove_page (priv->notebook, page_num);
+        page_num = gtk_notebook_get_current_page (GTK_NOTEBOOK (priv->notebook));
+        gtk_notebook_remove_page (GTK_NOTEBOOK (priv->notebook), page_num);
 }
 
 static void