[gnome-commander] Save empty string when device filename is null

[Uwe Scholz <uwescholz src gnome org>]

commit 108c71537d92c2e7806a0ea54f8fa5a1dc451aed
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Sun May 1 12:13:00 2022 +0200

    Save empty string when device filename is null

 src/gnome-cmd-con-device.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gnome-cmd-con-device.cc b/src/gnome-cmd-con-device.cc
index 6996dcbc..403e8650 100644
--- a/src/gnome-cmd-con-device.cc
+++ b/src/gnome-cmd-con-device.cc
@@ -690,7 +690,7 @@ const gchar *gnome_cmd_con_device_get_device_fn (GnomeCmdConDevice *dev)
     g_return_val_if_fail (dev != nullptr, nullptr);
     g_return_val_if_fail (dev->priv != nullptr, nullptr);
 
-    return dev->priv->device_fn;
+    return dev->priv->device_fn != nullptr ? dev->priv->device_fn : "";
 }