Fix ASAN failure in main.lock (and others)

Whenever one copies an IO_CACHE struct, one must remember to call
setup_io_cache, if not, the IO_CACHE's current_pos and end_pos
self-references will point to the previous struct's memory, which
could go out of scope. Commit 90038693903044bbbf7946ac128c3757ad33d7ba
fixes this problem in a more general fashion by removing the
self-references altogether, but for 5.5 we'll keep the old behaviour.

0 files changed, 0 insertions, 0 deletions