fm10k: no need to continue in fm10k_down if __FM10K_DOWN already set
Return early from fm10k_down() when we are already down, since that means another thread is either already finished or has started going down, so shouldn't conflict with them. Signed-off-by: NJacob Keller <jacob.e.keller@intel.com> Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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