[media] rtl2832: remove redundant function declaration

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-frontends/rtl2832.h

@@ -58,10 +58,6 @@ extern struct dvb_frontend *rtl2832_attach(
 	const struct rtl2832_config *cfg,
 	struct i2c_adapter *i2c
 );
-
-extern struct i2c_adapter *rtl2832_get_tuner_i2c_adapter(
-	struct dvb_frontend *fe
-);
 #else
 static inline struct dvb_frontend *rtl2832_attach(
 	const struct rtl2832_config *config,