iio: bmp280: zero-init buffer

Zero-initialize the buffer used with iio_push_to_buffers_with_ts(). The
struct used for the buffer has holes in it, so we need to make sure that
the holes are zeroed out rather than containing uninitialized data from
the stack.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-iio/aBoBR5D1UMjsSUfZ@stanley.mountain/


Fixes: 872c8014 ("iio: pressure: bmp280: drop sensor_data array")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250506-iio-pressure-bmp280-zero-init-buffer-v1-1-0935c31558ac@baylibre.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>