pkg/lwip: add missing initialization for async_cb #18693
Merged
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Contribution description
Without initializing async_cb to NULL it might be a value != NULL, which leads to sock->async_cb.gen() being called mistakenly in _netconn_cb.
gnrc_sock already does it with
reg->async_cb.generic = NULL;
Issues/PRs references
Dependency for and split out from #16853