acpi: Fix issue in the exception names.
acpi: Fix issue in the exception names.

This issue was caused by a reckless NULL -> nullptr find + replace in
commit 2cc5b7e6331ab4144911eac74407231a85e9caa5.

Signed-off-by: Pedro Falcato <d037c3eb54456eb57a351d3e1361e11b3d89c857@gmail.com>

heatd/Onyx,heatd/Onyx,heatd/Onyx,heatd/Onyx