sound: Remove dead code in pcm_register()

[christos]

Summary

Sponsored by: The FreeBSD Foundation
MFC after: 2 days

sys/dev/sound/pcm/sound.c

if (pcm_veto_load) {
                 return EINVAL;
         }
 
         d = device_get_softc(dev);
         d->dev = dev;
         d->lock = snd_mtxcreate(device_get_nameunit(dev), "sound cdev");
         cv_init(&d->cv, device_get_nameunit(dev));
         PCM_ACQUIRE_QUICK(d);
-#if 0
-        /*
-         * d->flags should be cleared by the allocator of the softc.
-         * We cannot clear this field here because several devices set
-         * this flag before calling pcm_register().
-         */
-        d->flags = 0;
-#endif
+
         i = 0;
         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
             "vpc", &i) != 0 || i != 0)
                 d->flags |= SD_F_VPC;
 
         if (resource_int_value(device_get_name(dev), device_get_unit(dev),
             "bitperfect", &i) == 0 && i != 0)
                 d->flags |= SD_F_BITPERFECT;