net: set static variable an initial value in atl2_probe()
cards_found is a static variable, but when it enters atl2_probe(), cards_found is set to zero, the value is not consistent with last probe, so next behavior is not our expect. Signed-off-by: NMao Wenan <maowenan@huawei.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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