powerpc/numa: use cached value of update->cpu in update_cpu_topology
There isn't any need to keep referring to update->cpu, as we've already checked cpu == update->cpu at this point. Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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