sched: Don't need call get_errno after task_activate

since task_activate don't save the error code into errno

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

binfmt/binfmt_execmodule.c

@@ -257,7 +257,6 @@ int exec_module(FAR const struct binary_s *binp)
   ret = task_activate((FAR struct tcb_s *)tcb);
   if (ret < 0)
     {
-      ret = -get_errno();
       berr("task_activate() failed: %d\n", ret);
       goto errout_with_tcbinit;
     }