[gnome-control-center] network: Fix possible invalid free

[Robert Ancell <rancell src gnome org>]

commit 9c19eb6eade0d3fa669940821fc71add6c5eb45f
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Tue Sep 24 21:25:44 2019 +0530

    network: Fix possible invalid free

 panels/network/cc-network-panel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/network/cc-network-panel.c b/panels/network/cc-network-panel.c
index 20d5ab21f..90e13eb0e 100644
--- a/panels/network/cc-network-panel.c
+++ b/panels/network/cc-network-panel.c
@@ -501,7 +501,7 @@ panel_add_device (CcNetworkPanel *panel, NMDevice *device)
 
         if (type == NM_DEVICE_TYPE_MODEM &&
             g_str_has_prefix (nm_device_get_udi (device), "/org/freedesktop/ModemManager1/Modem/")) {
-                g_autoptr(GDBusObject) modem_object;
+                g_autoptr(GDBusObject) modem_object = NULL;
 
                 if (panel->modem_manager == NULL) {
                         g_warning ("Cannot grab information for modem at %s: No ModemManager support",