arm64: fix wrong check of on_sdei_stack in nmi context
When doing unwind_frame() in the context of pseudo nmi (need enable CONFIG_ARM64_PSEUDO_NMI), reaching the bottom of the stack (fp == 0, pc != 0), function on_sdei_stack() will return true while the sdei acpi table is not inited in fact. This will cause a "NULL pointer dereference" oops when going on. Reviewed-by: NJulien Thierry <julien.thierry@arm.com> Signed-off-by: NWei Li <liwei391@huawei.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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