The unused variables were last used before commit 49ddd7e1
"paaudio: port to the new audio backend api".

Fixes: 49ddd7e1
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20200123074943.6699-3-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>