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jolly uploaded patch set #2 to this change.

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Fix: Prevent race conditions when accessing slotmap in bankd

All threads (main and workers) can use slotmap_by_bank() and
slotmap_by_client() to get a mapping entry from the slot map. While
working with this entry (reading values), it could be deleted by a
different thread.

For example, if a client connects to a worker, the worker will check if
there is an existing mapping between a reader and this client. If it
exists, slotmap_by_client() will return a pointer. If the mapping is
deleted at this time by the server, the worker uses a pointer to a
mapping entry that has just been freed.

Change-Id: I3464726f37beb7c47b4e1f00c018ffa4f3948906
---
M src/bankd/bankd_main.c
M src/slotmap.c
M src/slotmap.h
3 files changed, 53 insertions(+), 20 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-remsim refs/changes/64/42664/2

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