Luca Boccassi
24dee4afc5
link_configs_free() freed every LinkConfig via LIST_FOREACH but left
ctx->configs pointing at the (freed) former list head. That is harmless for
link_config_ctx_free(), which frees the context immediately afterwards, but
link_config_load() calls link_configs_free() up front to clear the context
before (re)loading — and the dangling head then makes the subsequent
LIST_PREPEND() and the eventual teardown dereference freed memory.
Use LIST_CLEAR(), which pops and frees each entry and resets the head to NULL.
Follow-up for af6f0d422c
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