Input: HIL - fix improper call to release_region()

Do not call release_region() if the code has been compiled
without CONFIG_HP300 support.

Signed-off-by: Cyrill V. Gorcunov <gorcunov@gmail.com>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>