[gnome-commander] Add null check

[Uwe Scholz <uwescholz src gnome org>]

commit f7c15b89de7ef2056f54472a83320ef1061a3f9e
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Thu Jan 13 23:13:08 2022 +0100

    Add null check

 src/gnome-cmd-file-selector.cc | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/gnome-cmd-file-selector.cc b/src/gnome-cmd-file-selector.cc
index 5347225c..b3a6a852 100644
--- a/src/gnome-cmd-file-selector.cc
+++ b/src/gnome-cmd-file-selector.cc
@@ -1557,6 +1557,8 @@ GtkWidget *GnomeCmdFileSelector::new_tab(GnomeCmdDir *dir, GnomeCmdFileList::Col
 
 void GnomeCmdFileSelector::update_tab_label(GnomeCmdFileList *fl)
 {
+    g_return_if_fail(fl->cwd != nullptr);
+
     const gchar *name = GNOME_CMD_FILE (fl->cwd)->get_name();
 
     switch (gnome_cmd_data.options.tab_lock_indicator)