[src/trunk]: src/share/man/man9 Be a little more consistent about nulls.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/104874b96fd7
branches:  trunk
changeset: 337026:104874b96fd7
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Mar 30 13:35:50 2015 +0000

description:
Be a little more consistent about nulls.

diffstat:

 share/man/man9/bufferio.9 |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diffs (29 lines):

diff -r 9b067456d86d -r 104874b96fd7 share/man/man9/bufferio.9
--- a/share/man/man9/bufferio.9 Mon Mar 30 13:26:55 2015 +0000
+++ b/share/man/man9/bufferio.9 Mon Mar 30 13:35:50 2015 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: bufferio.9,v 1.10 2015/03/30 13:26:55 riastradh Exp $
+.\"    $NetBSD: bufferio.9,v 1.11 2015/03/30 13:35:50 riastradh Exp $
 .\"
 .\" Copyright (c) 2015 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -159,7 +159,7 @@
 .It
 Otherwise, if
 .Fa bp Ns Li "->b_iodone"
-is null and
+is a null function pointer and
 .Dv B_ASYNC
 is not specified, the user may wait for the I/O transfer to complete
 with
@@ -364,7 +364,9 @@
 If
 .Fa waitok
 is false,
-returns null if none can be allocated immediately.
+returns
+.Dv NULL
+if none can be allocated immediately.
 .Pp
 The resulting
 .Vt "struct buf"