[media] bttv: fix querystd

AND the standard mask with the detected standards.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/pci/bt8xx/bttv-driver.c b/drivers/media/pci/bt8xx/bttv-driver.c
index bfcfa3e..c6532de 100644
--- a/drivers/media/pci/bt8xx/bttv-driver.c
+++ b/drivers/media/pci/bt8xx/bttv-driver.c
@@ -1760,9 +1760,9 @@
 	struct bttv *btv = fh->btv;
 
 	if (btread(BT848_DSTATUS) & BT848_DSTATUS_NUML)
-		*id = V4L2_STD_625_50;
+		*id &= V4L2_STD_625_50;
 	else
-		*id = V4L2_STD_525_60;
+		*id &= V4L2_STD_525_60;
 	return 0;
 }