[src/trunk]: src/share/man/man9 Two minor fixes.

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

details:   https://anonhg.NetBSD.org/src/rev/e965eda1a177
branches:  trunk
changeset: 448959:e965eda1a177
user:      isaki <isaki%NetBSD.org@localhost>
date:      Sat Feb 16 06:51:04 2019 +0000

description:
Two minor fixes.
- 0 -> NULL.
- avoid K&R and sync with reality.

diffstat:

 share/man/man9/audio.9 |  13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diffs (41 lines):

diff -r 4dac8b1578b2 -r e965eda1a177 share/man/man9/audio.9
--- a/share/man/man9/audio.9    Sat Feb 16 06:50:14 2019 +0000
+++ b/share/man/man9/audio.9    Sat Feb 16 06:51:04 2019 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: audio.9,v 1.49 2018/12/02 09:22:30 isaki Exp $
+.\"    $NetBSD: audio.9,v 1.50 2019/02/16 06:51:04 isaki Exp $
 .\"
 .\" Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -104,11 +104,8 @@
 .Va audio_attach_mi .
 This call should be
 .Bd -literal
-    void
-    audio_attach_mi(ahwp, hdl, dev)
-       struct audio_hw_if *ahwp;
-       void *hdl;
-       struct device *dev;
+    device_t
+    audio_attach_mi(const struct audio_hw_if *ahwp, void *hdl, device_t dev);
 .Ed
 .Pp
 The
@@ -136,7 +133,7 @@
 The fields of
 .Va audio_hw_if
 are described in some more detail below.
-Some fields are optional and can be set to 0 if not needed.
+Some fields are optional and can be set to NULL if not needed.
 .Bl -tag -width indent
 .It Dv int open(void *hdl, int flags)
 optional, is called when the audio device is opened.
@@ -417,7 +414,7 @@
 The reason for using a device dependent routine instead of
 .Xr malloc 9
 is that some buses need special allocation to do DMA.
-Returns the address of the buffer, or 0 on failure.
+Returns the address of the buffer, or NULL on failure.
 .It Dv void freem(void *hdl, void *addr, size_t size)
 optional, is called to free memory allocated by
 .Va allocm .