Building with Sparse enabled prints this warning:

    warning: incorrect type in assignment (different base types)
        expected signed int x
        got restricted __le32 [usertype]

Cast the return value of cpu_to_le32() to fix the warning.

Fixes: 08177f40 ("HID: uclogic: merge hid-huion driver in hid-uclogic")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>