ACPI / watchdog: Fix off-by-one error at resource assignment

ACPI / watchdog: Fix off-by-one error at resource assignment

The resource allocation in WDAT watchdog has off-one-by error, it sets
one byte more than the actual end address.  This may eventually lead
to unexpected resource conflicts.

Fixes: 058dfc767008 (ACPI / watchdog: Add support for WDAT hardware watchdog)
Cc: 4.9+ <[email protected]> # 4.9+
Signed-off-by: Takashi Iwai <[email protected]>
Acked-by: Mika Westerberg <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>