HID: simplify snto32()

snto32() does exactly what sign_extend32() does, but handles
potentially malformed data coming from the device. Keep the checks,
but then call sign_extend32() to perform the actual conversion.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://patch.msgid.link/20241003144656.3786064-1-dmitry.torokhov@gmail.com


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>