BUG/MEDIUM: stick-table: fix regression caused by a change in proxy struct

In commit 1b8e68e ("MEDIUM: stick-table: Stop handling stick-tables as
proxies."), the ->table member of proxy struct was replaced by a pointer
that is not always checked and in some situations can cause a segfault,
eg. during reload or while using "show table" on CLI socket.

No backport is needed.
3 files changed