If dsp_unit2name() fails, we'll get to out2 with b, bs and devinfo
uninitialized, which will result in a panic.
Reported by: Pierre Pronchery <pierre@freebsdfoundation.org>
Reported by: Coverity Scan
CID: 1545029, 1545025
Pull-request: https://github.com/freebsd/freebsd-src/pull/1240
Sponsored by: The FreeBSD Foundation
MFC after: 1 day