acpica: fix CVE-2024-24856

acpica: fix CVE-2024-24856

The memory allocation function ACPI_ALLOCATE_ZEROED does not guarantee a
successful allocation, but the subsequent code directly dereferences the
pointer that receives it, which may lead to null pointer dereference. To
fix this issue, a null pointer check should be added. If it is null,
return exception code AE_NO_MEMORY.

Refer: https://nvd.nist.gov/vuln/detail/CVE-2024-24856

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>