V4L/DVB (12791): tm6000: fix poll() method

Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/tm6000/tm6000-video.c

@@ -1449,9 +1449,8 @@ tm6000_poll(struct file *file, struct poll_table_struct *wait)
 		buf = list_entry(fh->vb_vidq.stream.next,struct tm6000_buffer,vb.stream);
 	} else {
 		/* read() capture */
-		buf = (struct tm6000_buffer*)fh->vb_vidq.read_buf;
-		if (NULL == buf)
-			return POLLERR;
+		return videobuf_poll_stream(file, &fh->vb_vidq,
+					    wait);
 	}
 	poll_wait(file, &buf->vb.done, wait);
 	if (buf->vb.state == STATE_DONE ||