V4L/DVB (7337): ivtv: fix polling bug

The q_io queue was never taken into account by the poll function. Thanks to
Andy Walls for finding this bug.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-fileops.c

@@ -753,7 +753,7 @@ unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
 	IVTV_DEBUG_HI_FILE("Encoder poll\n");
 	poll_wait(filp, &s->waitq, wait);
 
-	if (eof || s->q_full.length)
+	if (eof || s->q_full.length || s->q_io.length)
 		return POLLIN | POLLRDNORM;
 	return 0;
 }