improve comment regarding child_return() clearing errno-indicating flag

diff --git a/sys/arch/riscv64/riscv64/syscall.c b/sys/arch/riscv64/riscv64/syscall.c
index 61d1e2d..584726d 100644 (file)
--- a/sys/arch/riscv64/riscv64/syscall.c
+++ b/sys/arch/riscv64/riscv64/syscall.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: syscall.c,v 1.6 2021/05/14 06:48:52 jsg Exp $ */
+/*     $OpenBSD: syscall.c,v 1.7 2021/05/15 13:56:56 deraadt Exp $     */
 
 /*
  * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
@@ -125,8 +125,7 @@ child_return(arg)
 
        frame->tf_a[0] = 0;
        frame->tf_a[1] = 1;
-       // XXX How to signal error?
-       frame->tf_t[0] = 0;
+       frame->tf_t[0] = 0;                     /* no error */
 
        KERNEL_UNLOCK();