[gnome-control-center] network: Make function private

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 6211337ad62606d7898e8b4bd89cd8e7896c5ab9
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Oct 1 12:31:05 2019 +1300

    network: Make function private

 panels/network/panel-common.c | 2 +-
 panels/network/panel-common.h | 3 ---
 2 files changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/panels/network/panel-common.c b/panels/network/panel-common.c
index 7759360db..34c0b24c8 100644
--- a/panels/network/panel-common.c
+++ b/panels/network/panel-common.c
@@ -377,7 +377,7 @@ panel_set_device_widget_details (GtkBuilder *builder,
 }
 
 
-gboolean
+static gboolean
 panel_set_device_widget_header (GtkBuilder *builder,
                                 const gchar *widget_suffix,
                                 const gchar *heading)
diff --git a/panels/network/panel-common.h b/panels/network/panel-common.h
index 0fa3411ac..6a68533a7 100644
--- a/panels/network/panel-common.h
+++ b/panels/network/panel-common.h
@@ -38,9 +38,6 @@ void             panel_set_device_row_status                   (GtkBuilder *buil
 gboolean         panel_set_device_widget_details               (GtkBuilder *builder,
                                                                 const gchar *widget_suffix,
                                                                 const gchar *value);
-gboolean         panel_set_device_widget_header                (GtkBuilder *builder,
-                                                                const gchar *widget_suffix,
-                                                                const gchar *value);
 void             panel_set_device_widgets                      (GtkBuilder *builder,
                                                                 NMDevice *device);
 void             panel_unset_device_widgets                    (GtkBuilder *builder);