arm64: use the correct function type in SYSCALL_DEFINE0
Although a syscall defined using SYSCALL_DEFINE0 doesn't accept parameters, use the correct function type to avoid indirect call type mismatches with Control-Flow Integrity checking. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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