[Varnish] #1755: The (struct backend).n_conn counter is never decremented

[Varnish]

#1755: The (struct backend).n_conn counter is never decremented
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 Reporter:  Dridi     |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  trunk
 Severity:  blocker   |  Resolution:
 Keywords:            |
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Comment (by Dridi):

 I have a patch that solves this issue, but also maintains consistency
 between the {{{refcount}}} and {{{n_conn}}} fields, and also with the
 {{{(struct tcp_pool).n_used}}} field. It also solves another issue in
 pending work on dynamic backends.

 The code is currently not ready to be submitted, it needs a bit of
 cleaning, especially with regards to locking operations.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1755#comment:1>
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