Jan Schmidt a14f22f65b netconn_gethostbyname: Fix race reporting success ...

If the DNS request is dispatched and performed very quickly,
then it can complete before tcpip_callback() actually returns,
in which case we'll destroy the actual err_t error value passed
in the message. Use a local variable for the tcpip_callback
error code so that can't happen.

Resolves #269 https://github.com/espressif/esp-idf/pull/269

2017-01-20 14:57:00 +11:00

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