iio: accel: msa311: 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-v1-2-ebb2d0a24302@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/msa311.c

@@ -897,9 +897,7 @@ static irqreturn_t msa311_buffer_thread(int irq, void *p)
 	struct {
 		__le16 channels[MSA311_SI_Z + 1];
 		aligned_s64 ts;
-	} buf;
-
-	memset(&buf, 0, sizeof(buf));
+	} buf = { };
 
 	mutex_lock(&msa311->lock);