[media] DiBcom: correct warnings

The intend of this patch is to correct some warnings given.

Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr>
Signed-off-by: Patrick Boettcher <patrick.boettcher@dibcom.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/frontends/dib7000p.c b/drivers/media/dvb/frontends/dib7000p.c
index 2b52542..3ab695b 100644
--- a/drivers/media/dvb/frontends/dib7000p.c
+++ b/drivers/media/dvb/frontends/dib7000p.c
@@ -1876,7 +1876,8 @@
 	return num;
 }
 
-int dib7090p_rw_on_apb(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num, u16 apb_address)
+static int dib7090p_rw_on_apb(struct i2c_adapter *i2c_adap,
+		struct i2c_msg msg[], int num, u16 apb_address)
 {
 	struct dib7000p_state *state = i2c_get_adapdata(i2c_adap);
 	u16 word;