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

Fix a cut-and-paste error
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88-cards.c

@@ -2416,7 +2416,7 @@ static void cx88_card_setup(struct cx88_core *core)
 		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;