to ensure that i8042 interrupt handler that is shared among
       several ports does not reference deleted ports. Also rename
       i8042_valies structure to i8042_port, consolidate handling
       of KBD, AUX and MUX ports, rearrange interrupt handler code.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>