[gimp] quit-dialog: stops crashing on quit dialog

[Jehan <jehanp src gnome org>]

commit 83397cbb159376e43f699f2f67b83c4e971a21c2
Author: Lukas Oberhuber <lukaso gmail com>
Date:   Sat Jun 25 14:50:29 2022 +0100

    quit-dialog: stops crashing on quit dialog
    
    @jralls found uninitialized variables in the quit dialog that can cause
    crashes.

 app/dialogs/quit-dialog.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/app/dialogs/quit-dialog.c b/app/dialogs/quit-dialog.c
index 35680f740c..1e43807e71 100644
--- a/app/dialogs/quit-dialog.c
+++ b/app/dialogs/quit-dialog.c
@@ -302,6 +302,8 @@ quit_close_all_dialog_response (GtkWidget  *dialog,
   gboolean  do_quit = private->do_quit;
 
   gtk_widget_destroy (dialog);
+  private->box = NULL;
+  private->dialog = NULL;
 
   if (response_id == GTK_RESPONSE_OK)
     {
@@ -375,7 +377,7 @@ quit_close_all_dialog_container_changed (GimpContainer *images,
        * actions provoking warnings. Let's just close as soon as
        * possible with an idle source.
        * Also the idle source has another benefit: allowing to change
-       * one's mind and not exist after the last save, for instance by
+       * one's mind and not exit after the last save, for instance by
        * hitting Esc quickly while the last save is in progress.
        */
       g_idle_add ((GSourceFunc) quit_close_all_idle, private);