igb: fix null pointer dereference seen with fiber NICs
With a fiber or serdes NIC installed the driver was causing a null pointer dereference on driver unload. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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