iio: light: opt4060: use = { } instead of memset()

Use { } instead of memset() to zero-initialize stack memory to simplify
the code.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250611-iio-zero-init-stack-with-instead-of-memset-v1-20-ebb2d0a24302@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: dlech

drivers/iio/light/opt4060.c

@@ -1083,16 +1083,14 @@ static irqreturn_t opt4060_trigger_handler(int irq, void *p)
 	struct  {
 		u32 chan[OPT4060_NUM_CHANS];
 		aligned_s64 ts;
-	} raw;
+	} raw = { };
 	int i = 0;
 	int chan, ret;
 
 	/* If the trigger is not from this driver, a new sample is needed.*/
 	if (iio_trigger_validate_own_device(idev->trig, idev))
 		opt4060_trigger_new_samples(idev);
 
-	memset(&raw, 0, sizeof(raw));
-
 	iio_for_each_active_channel(idev, chan) {
 		if (chan == OPT4060_ILLUM)
 			ret = opt4060_calc_illuminance(chip, &raw.chan[i++]);