iio: proximity: Fix use-after-free in hx9023s_send_cfg()

Reorder the assignment of fw_size to happen before release_firmware()
to avoid accessing the firmware structure after it's been freed.

Fixes: e9ed97be ("iio: proximity: hx9023s: Added firmware file parsing functionality")
Closes: https://scan7.scan.coverity.com/#/project-view/52337/11354?selectedIssue=1602791


Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@gmail.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250107123510.44978-1-dheeraj.linuxdev@gmail.com


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