sound/virtio: Fix cancel_sync warnings on uninitialized work_structs

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DEBIAN-CVE-2025-37805

In the Linux kernel, the following vulnerability has been resolved: sound/virtio: Fix cancelsync warnings on uninitialized workstructs Betty reported hitting the following warning: 8.709131 T221 WARNING: CPU: 2 PID: 221 at kernel/workqueue.c:4182 ... 8.713282 T221 Call trace: 8.713365 T221...