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9c13b62b47
On server connection migration from one thread to another, the wrong idle thread-specific counter is decremented. This bug was introduced since commit 3d52f0f1f828acb2a74b3f13fcc3fa069106d09f due to the factorization with srv_use_idle_conn. However, this statement is only executed from conn_backend_get. Extract the decrement from srv_use_idle_conn in conn_backend_get and use the correct thread-specific counter. Rename the function to srv_use_conn to better reflect its purpose as it is also used with a newly initialized connection not in the idle list. As a side change, the connection insertion to available list has also been extracted to conn_backend_get. This will be useful to be able to specify an alternative list for protocol subject to HOL risk that should not be shared between several clients. This bug is only present in this release and thus do not need a backport.