Fix wnarrowing on raspberry pi #83
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In getAddressAsString(), we are comparing ans <= 0 to check for failure. When compiling with g++ 11.2 (Ubuntu 22.02), this gave the following error: src/arch/linux/net_socket.cpp:170:15: error: ordered comparison of pointer with integer zero (‘const char*’ and ‘int’) inet_ntop returns a NULL pointer for failure and non-NULL otherwise. So in order to fix this, we can simply compare ans with NULL.
A simple static cast seems to do the trick.
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