ftpd: Set current directory after session close

The chroot() is an implicit chdir("/").  Set the current directory to
"/" after session close.  This helps to avoid references to mounted file
systems in dynamic media.

cpukit/ftpd/ftpd.c

@@ -1890,7 +1890,6 @@ session(rtems_task_argument arg)
       &set);
 
     chroot_made = chroot_made || chroot(ftpd_root) == 0;
-    chdir("/");
 
     errno = 0;
 
@@ -1926,6 +1925,8 @@ session(rtems_task_argument arg)
     free(info->user);
     free(info->pass);
     task_pool_release(info);
+
+    chdir("/");
   }
 }