V4L/DVB (10508): saa7134: Cleanup: remove unused waitqueue from struct

The waitqueue is never used. So, let's just remove it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/saa7134/saa7134.h

@@ -446,7 +446,6 @@ struct saa7134_dmasound {
 	unsigned int               bufsize;
 	struct saa7134_pgtable     pt;
 	struct videobuf_dmabuf     dma;
-	wait_queue_head_t          wq;
 	unsigned int               dma_blk;
 	unsigned int               read_offset;
 	unsigned int               read_count;