Andrew Turner 4e50efb194 Check cpu_softc is not NULL before dereferencing
In the acpi_cpu_postattach SYSINIT function cpu_softc may be NULL, e.g.
on arm64 when booting from FDT. Check it is not NULL at the start of
the function so we don't try to dereference a NULL pointer.

Sponsored by:	The FreeBSD Foundation
2021-09-27 11:32:12 +00:00
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