V4L/DVB: au0828: move dereference below sanity checks

This function has sanity checks to make sure that "dev" is non-null.  I
moved the dereference down below the checks.  In the current code "dev"
is never actually null.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/au0828/au0828-video.c

@@ -441,7 +441,7 @@ static void au0828_copy_vbi(struct au0828_dev *dev,
 			      unsigned char *outp, unsigned long len)
 {
 	unsigned char *startwrite, *startread;
-	int bytesperline = dev->vbi_width;
+	int bytesperline;
 	int i, j = 0;
 
 	if (dev == NULL) {
@@ -464,6 +464,8 @@ static void au0828_copy_vbi(struct au0828_dev *dev,
 		return;
 	}
 
+	bytesperline = dev->vbi_width;
+
 	if (dma_q->pos + len > buf->vb.size)
 		len = buf->vb.size - dma_q->pos;