V4L/DVB (6804): __videobuf_read_start is static

Thanks to Jean Delvare <khali@linux-fr.org> for pointing this.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/videobuf-core.c

@@ -812,7 +812,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q,
 }
 
 /* Locking: Caller holds q->lock */
-int __videobuf_read_start(struct videobuf_queue *q)
+static int __videobuf_read_start(struct videobuf_queue *q)
 {
 	enum v4l2_field field;
 	unsigned long flags = 0;