Web-MQTT: don't call FHC when connection terminates early (backport #9654) (backport #9655) #9657
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When the Web-MQTT connection terminates early because of no supported
subprotocol, `terminate/3` called fhc release although no fhc obtain was
called yet. This was the case even when `use_file_handle_cache` was false,
because `#state.should_use_fhc` was not initialized.
Fixing this avoids the below harmless warning
```
[debug] error updating ets counter <0.1224.0> in table #Ref<0.2797411137.1366163457.189876>:
[{ets, update_counter,
[#Ref<0.2797411137.1366163457.189876>,
<0.1224.0>, {5, -1}],
...
[warning] FHC: failed to update counter 'obtained_socket', client pid: <0.1224.0>
```
(cherry picked from commit f3410db)
(cherry picked from commit 14ced5e)
# Conflicts:
# deps/rabbitmq_web_mqtt/src/rabbit_web_mqtt_handler.erl
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This is an automatic backport of pull request #9655 done by Mergify.
Cherry-pick of 14ced5e has failed:
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