media: dw2102: fix a potential buffer overflow

As pointed by smatch:
	 drivers/media/usb/dvb-usb/dw2102.c:802 su3000_i2c_transfer() error: __builtin_memcpy() '&state->data[4]' too small (64 vs 67)

That seemss to be due to a wrong copy-and-paste.

Fixes: 0e148a52 ("media: dw2102: Don't translate i2c read into write")
Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/dvb-usb/dw2102.c

@@ -789,7 +789,7 @@ static int su3000_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 
 			if (msg[j].flags & I2C_M_RD) {
 				/* single read */
-				if (1 + msg[j].len > sizeof(state->data)) {
+				if (4 + msg[j].len > sizeof(state->data)) {
 					warn("i2c rd: len=%d is too big!\n", msg[j].len);
 					num = -EOPNOTSUPP;
 					break;