dvb-usb/technisat-usb2: Fix cut-n-paste thinko

[Dave Jones <davej@redhat.com>]

This looks like it was cut and pasted from the code above which does similar checks on txlen,
but someone forgot to change the variable.

Signed-off-by: Dave Jones <davej@fedoraproject.org>

diff --git a/drivers/media/usb/dvb-usb/technisat-usb2.c b/drivers/media/usb/dvb-usb/technisat-usb2.c
index 40832a1..98d24ae 100644
--- a/drivers/media/usb/dvb-usb/technisat-usb2.c
+++ b/drivers/media/usb/dvb-usb/technisat-usb2.c
@@ -102,7 +102,7 @@ static int technisat_usb2_i2c_access(struct usb_device *udev,
 	if (rxlen > 62) {
 		err("i2c RX buffer can't exceed 62 bytes (dev 0x%02x)",
 				device_addr);
-		txlen = 62;
+		rxlen = 62;
 	}
 
 	b[0] = I2C_SPEED_100KHZ_BIT;