media: ov8856: Check reading clock frequency succeeded

Instead of blindly trusting getting the clock frequency succeeded end then
testing it against a pre-defined value, verify reading the value
succeeded.

Fixes: 879347f0 ("media: ov8856: Add support for OV8856 sensor")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/ov8856.c

@@ -1106,7 +1106,10 @@ static int ov8856_check_hwcfg(struct device *dev)
 	if (!fwnode)
 		return -ENXIO;
 
-	fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
+	ret = fwnode_property_read_u32(fwnode, "clock-frequency", &mclk);
+	if (ret)
+		return ret;
+
 	if (mclk != OV8856_MCLK) {
 		dev_err(dev, "external clock %d is not supported", mclk);
 		return -EINVAL;