powerpc/msi: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this switches from an unchanging variable to a constant expression to eliminate the VLA generation. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.comSigned-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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