[gnome-commander] Null check when doing legacy mount

[Uwe Scholz <uwescholz src gnome org>]

commit 9b353615a78a2dda2292cf221e5c1ce862adcea9
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Sun Nov 7 21:52:28 2021 +0100

    Null check when doing legacy mount

 src/gnome-cmd-con-device.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/gnome-cmd-con-device.cc b/src/gnome-cmd-con-device.cc
index ba3811fe..094ad9e6 100644
--- a/src/gnome-cmd-con-device.cc
+++ b/src/gnome-cmd-con-device.cc
@@ -96,7 +96,7 @@ static void do_legacy_mount(GnomeCmdCon *con)
 
     if (!is_mounted (dev_con))
     {
-        gchar *cmd;
+        gchar *cmd = nullptr;
         gchar *emsg = nullptr;
 
         if (dev_con->priv->device_fn != nullptr && dev_con->priv->mountp != nullptr)
@@ -108,6 +108,9 @@ static void do_legacy_mount(GnomeCmdCon *con)
                 cmd = g_strdup_printf ("mount %s", dev_con->priv->mountp);
         }
 
+        if (!cmd)
+            return;
+
         DEBUG ('m', "Mount command: %s\n", cmd);
         ret = system (cmd);
         estatus = WEXITSTATUS (ret);