V4L/DVB (7327): cx88: Fix memset for tuner-xc3028 control

Fix a cut-and-paste error

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/cx88/cx88-cards.c b/drivers/media/video/cx88/cx88-cards.c
index 3e7ddee..4c1e876 100644
--- a/drivers/media/video/cx88/cx88-cards.c
+++ b/drivers/media/video/cx88/cx88-cards.c
@@ -2416,7 +2416,7 @@
 		struct v4l2_priv_tun_config  xc2028_cfg;
 		struct xc2028_ctrl           ctl;
 
-		memset(&xc2028_cfg, 0, sizeof(ctl));
+		memset(&xc2028_cfg, 0, sizeof(xc2028_cfg));
 		memset(&ctl, 0, sizeof(ctl));
 
 		ctl.fname   = XC2028_DEFAULT_FIRMWARE;