parport_pc: after superio probing restore original register values

parport_pc: after superio probing restore original register values

CONFIG_PARPORT_PC_SUPERIO probes for various superio chips by writing
byte sequences to a set of different potential I/O ranges.  But the
probed ranges are not exclusive to parallel ports.  Some of our boards
just happen to have a watchdog in one of them.  Took us almost a week
to figure out why some distros reboot without warning after running
flawlessly for 3 hours.  For exactly 170 = 0xAA minutes, that is ...

Fixed by restoring original values after probing.  Also fixed too small
request_region() in detect_and_report_it87().

Signed-off-by: Jens Rottmann <[email protected]>
Signed-off-by: Alan Cox <[email protected]>
Cc: <[email protected]>
Acked-by: Jeff Garzik <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>