[media] rtl2832: remove compiler warning

Cleaning up the following compiler warning:
rtl2832.c:703:12: warning: 'tmp' may be used uninitialized in this function

Even though it could never happen since if rtl2832_rd_demod_reg () doesn't set
tmp, this line would never run because we go to err. It is still nice to avoid
compiler warnings.

[mchehab@osg.samsung.com: fix a merge conflict with another patch meant
 to fix the same bug, but doing it at the wrong way]
Signed-off-by: NLuis de Bethencourt <luis.bg@samsung.com>
Reviewed-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/rtl2832.c

@@ -685,7 +685,7 @@ static int rtl2832_read_status(struct dvb_frontend *fe, fe_status_t *status)
 	struct rtl2832_dev *dev = fe->demodulator_priv;
 	struct i2c_client *client = dev->client;
 	int ret;
-	u32 tmp = 0;
+	u32 uninitialized_var(tmp);
 
 	dev_dbg(&client->dev, "\n");