V4L/DVB (3320): Check if PLL-description is set

- Check if in the dvb-usb-device-structure the dvb_pll_desc is set before use.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

drivers/media/dvb/dvb-usb/dvb-usb-i2c.c

@@ -52,9 +52,8 @@ int dvb_usb_pll_init_i2c(struct dvb_frontend *fe)
 	struct i2c_msg msg = { .addr = d->pll_addr, .flags = 0, .buf = d->pll_init, .len = 4 };
 	int ret = 0;
 
-	/* if there is nothing to initialize */
-	if (d->pll_init[0] == 0x00 && d->pll_init[1] == 0x00 &&
-		d->pll_init[2] == 0x00 && d->pll_init[3] == 0x00)
+	/* if pll_desc is not used */
+	if (d->pll_desc == NULL)
 		return 0;
 
 	if (d->tuner_pass_ctrl)
@@ -80,6 +79,9 @@ int dvb_usb_pll_set(struct dvb_frontend *fe, struct dvb_frontend_parameters *fep
 {
 	struct dvb_usb_device *d = fe->dvb->priv;
 
+	if (d->pll_desc == NULL)
+		return 0;
+
 	deb_pll("pll addr: %x, freq: %d %p\n",d->pll_addr,fep->frequency,d->pll_desc);
 
 	b[0] = d->pll_addr << 1;