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sound: Remove unused "num" argument from chn_init() and related callers

Description

sound: Remove unused "num" argument from chn_init() and related callers

It is always -1 (i.e unused).

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Reviewed by: dev_submerge.ch
Differential Revision: https://reviews.freebsd.org/D45095

(cherry picked from commit 3af2beb8b24ba21fb7e7fbd165a79b8eeff37712)

Details