[media] em28xx: Remove unused list_head struct for queued buffers

The list_head struct usage was fully removed by commit
d7aa80207babe694b316a48200b096cf0336ecb3.

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2 files changed