media: ddbridge: remove unreachable code

>From smatch:

  drivers/media/pci/ddbridge/ddbridge-core.c:3490 snr_store() info: ignoring unreachable code.

In fact, the function immediately returns zero, so remove it and update
ddb_attrs_snr[] to not reference it anymore.

Cc: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Tested-by: Richard Scobie <r.scobie@clear.net.nz>
Tested-by: Jasmin Jessich <jasmin@anw.at>
Tested-by: Dietmar Spingler <d_spingler@freenet.de>
Tested-by: Manfred Knick <Manfred.Knick@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/ddbridge/ddbridge-core.c

@@ -3092,25 +3092,6 @@ static ssize_t snr_show(struct device *device,
 	return sprintf(buf, "%s\n", snr);
 }
 
-
-static ssize_t snr_store(struct device *device, struct device_attribute *attr,
-			 const char *buf, size_t count)
-{
-	struct ddb *dev = dev_get_drvdata(device);
-	int num = attr->attr.name[3] - 0x30;
-	u8 snr[34] = { 0x01, 0x00 };
-
-	return 0; /* NOE: remove completely? */
-	if (count > 31)
-		return -EINVAL;
-	if (dev->port[num].type >= DDB_TUNER_XO2)
-		return -EINVAL;
-	memcpy(snr + 2, buf, count);
-	i2c_write(&dev->i2c[num].adap, 0x57, snr, 34);
-	i2c_write(&dev->i2c[num].adap, 0x50, snr, 34);
-	return count;
-}
-
 static ssize_t bsnr_show(struct device *device,
 			 struct device_attribute *attr, char *buf)
 {
@@ -3250,10 +3231,10 @@ static struct device_attribute ddb_attrs_fan[] = {
 };
 
 static struct device_attribute ddb_attrs_snr[] = {
-	__ATTR(snr0, 0664, snr_show, snr_store),
-	__ATTR(snr1, 0664, snr_show, snr_store),
-	__ATTR(snr2, 0664, snr_show, snr_store),
-	__ATTR(snr3, 0664, snr_show, snr_store),
+	__ATTR_MRO(snr0, snr_show),
+	__ATTR_MRO(snr1, snr_show),
+	__ATTR_MRO(snr2, snr_show),
+	__ATTR_MRO(snr3, snr_show),
 };
 
 static struct device_attribute ddb_attrs_ctemp[] = {