[gtk/gtk-3-24] gtk/gtkfilechoosernativeportal.c: Fix on C89 compilers

[Chun-wei Fan <fanchunwei src gnome org>]

commit dd5fd12343930ffeda46a85bd8594d26a01ffa17
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Jul 16 18:31:37 2020 +0800

    gtk/gtkfilechoosernativeportal.c: Fix on C89 compilers
    
    Make sure we declare variables at the top of the block-we can't declare
    variables in a for loop initilization in this case.

 gtk/gtkfilechoosernativeportal.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkfilechoosernativeportal.c b/gtk/gtkfilechoosernativeportal.c
index e784784a41..a401ec970b 100644
--- a/gtk/gtkfilechoosernativeportal.c
+++ b/gtk/gtkfilechoosernativeportal.c
@@ -138,7 +138,9 @@ response_cb (GDBusConnection  *connection,
        */
       GtkFileFilter *filter_to_select = filter;
       GSList *filters = gtk_file_chooser_list_filters (GTK_FILE_CHOOSER (self));
-      for (GSList *l = filters; l; l = l->next)
+      GSList *l;
+
+      for (l = filters; l; l = l->next)
         {
           GtkFileFilter *f = l->data;
           if (g_strcmp0 (gtk_file_filter_get_name (f), current_filter_name) == 0)