media: dvb-usb: don't check number of messages in the driver

Since commit 1eace834 ("i2c: add param sanity check to
i2c_transfer()"), the I2C core does this check now. We can remove it
from drivers.
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/dvb-usb/m920x.c

@@ -255,9 +255,6 @@ static int m920x_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], int nu
 	int i, j;
 	int ret = 0;
 
-	if (!num)
-		return -EINVAL;
-
 	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
 		return -EAGAIN;