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sound: Assert that we do not enter chn_sleep() with CHN_F_SLEEPING

Description

sound: Assert that we do not enter chn_sleep() with CHN_F_SLEEPING

Sponsored by: The FreeBSD Foundation
MFC after: 1 day
Reviewed by: markj, emaste
Differential Revision: https://reviews.freebsd.org/D44959

(cherry picked from commit fa284525499d75955525839074bf5968d0923e6b)