V4L/DVB: tm6000: bugfix image position

bugfix incorrect image and line position in videobuffer
Signed-off-by: Stefan Ringel <stefan.ringel@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/tm6000/tm6000-video.c

@@ -225,8 +225,8 @@ static int copy_packet(struct urb *urb, u32 header, u8 **ptr, u8 *endp,
 			 * It should, instead, check if the user selected
 			 * entrelaced or non-entrelaced mode
 			 */
-			pos= ((line<<1)+field)*linewidth +
-				block*TM6000_URB_MSG_LEN;
+			pos = ((line << 1) - field - 1) * linewidth +
+				block * TM6000_URB_MSG_LEN;
 
 			/* Don't allow to write out of the buffer */
 			if (pos+TM6000_URB_MSG_LEN > (*buf)->vb.size) {