[media] si2168: rename device state variable from 's' to 'dev'

'dev' is most common name in kernel for structure containing device
state instance, so rename it.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/si2168_priv.h

@@ -28,7 +28,7 @@
 #define SI2168_B40_FIRMWARE_FALLBACK "dvb-demod-si2168-02.fw"
 
 /* state struct */
-struct si2168 {
+struct si2168_dev {
 	struct i2c_client *client;
 	struct i2c_adapter *adapter;
 	struct mutex i2c_mutex;