powerpc/crash: Remove the test for cpu_online in the IPI callback
Our check was extra cautious, we've audited crash_send_ipi and it sends an IPI only to online CPU's. Removal of this check should have not functional impact on crash kdump. Signed-off-by: NBalbir Singh <bsingharora@gmail.com> Reviewed-by: NNicholas Piggin <npiggin@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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