[Bug 1364] telemetry conns may leak in certain situation

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1364

            Bug ID: 1364
           Summary: telemetry conns may leak in certain situation
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: other
          Assignee: dev at dpdk.org
          Reporter: 1819846787 at qq.com
  Target Milestone: ---

Every time the telemetry server successfully returns from the accept, it
atomically increases the value of num_clients（if < MAX_CONNECTIONS） and then
executes pthread_create to create a thread to execute the client_handler
function. In this function, some information will be written to the client. If
the write fails, the thread returns NULL without atomically reducing
num_clients, this will cause the Telemetry server to run for a period of time,
and the value of num_clients will be greater than 10, resulting in telemetry
being unavailable. 
Therefore, the decrease in atomicity v2_clients should occur after the write()
failure

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