git: sysconf.3: Point out that -1 may be returned even if the call succeeded.

[Sascha Wildner]

commit 47205a89f523fd464e9c266b7d0649af8cd76ca6
Author: Sascha Wildner <saw at online.de>
Date:   Tue Jun 15 17:28:42 2021 +0200

    sysconf.3: Point out that -1 may be returned even if the call succeeded.

Summary of changes:
 lib/libc/gen/sysconf.3 | 9 +++++++++
 1 file changed, 9 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/47205a89f523fd464e9c266b7d0649af8cd76ca6


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