media: si4713: 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/radio/si4713/radio-usb-si4713.c

@@ -370,9 +370,6 @@ static int si4713_transfer(struct i2c_adapter *i2c_adapter,
 	int retval = -EINVAL;
 	int i;
 
-	if (num <= 0)
-		return 0;
-
 	for (i = 0; i < num; i++) {
 		if (msgs[i].flags & I2C_M_RD)
 			retval = si4713_i2c_read(radio, msgs[i].buf, msgs[i].len);