Fix tab/space typo

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Don't use ACPI_FREE_BUFFER macro

The ACPI_FREE_BUFFER macro is now gone in 3.14-rc1 so we use
kfree() directly on the allocated buffer instead.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>