6922 could have been clearer about event vdev pointer
At the beginning of the function, we try to convert a guid to a vdev_t pointer by calling spa_lookup_by_guid with aux B_FALSE. It is my understanding that this will always result in vd NULL if the guid is for an L2ARC device. That means that when we make it into the sav_vdevs != NULL else-if, the sole user of vd will always be NULL.
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