From c876175c6160f55a95bd3b0bd19bf11f3df4f4ee Mon Sep 17 00:00:00 2001
From: Enji Cooper <ngie@FreeBSD.org>
Date: Mon, 13 Mar 2017 02:12:33 +0000
Subject: [PATCH] lib/libcam/cam.3: note that cam_freeccb(3) with ccb == NULL
 is a no-op

This allows me to accurately test this scenario, and for others to rely
on the behavior, instead of relying on knowledge obtained via code
inspection.

Wording borrowed from free(3).

MFC after:	1 week
Requested by:	ken (D9928)
Reviewed by:	imp
Sponsored by:	Dell EMC Isilon
Differential Revision:	D9969
---
 lib/libcam/cam.3 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/libcam/cam.3 b/lib/libcam/cam.3
index fbcb016ff48..8accf63c746 100644
--- a/lib/libcam/cam.3
+++ b/lib/libcam/cam.3
@@ -302,6 +302,11 @@ structure.
 .Fn cam_freeccb
 frees CCBs allocated by
 .Fn cam_getccb .
+If
+.Va ccb
+is
+.Dv NULL ,
+no action is taken.
 .Pp
 .Fn cam_path_string
 takes as arguments a