p2p/discover: fix crash when revalidated node is removed #2048
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In #29572, I assumed the revalidation list that the node is contained in could only ever be changed by the outcome of a revalidation request. But turns out that's not true: if the node gets removed due to FINDNODE failure, it will also be removed from the list it is in. This causes a crash. The invariant is: while node is in table, it is always in exactly one of the two lists. So it seems best to store a pointer to the current list within the node itself.
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