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Fix compile error error about array initialization #48

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Fix compile error error about array initialization #48

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DialDiscovery.cpp:317:19: error: variable-sized object may not be initialized
    char send_buf[strlen((char*)ssdp_msearch) + INET_ADDRSTRLEN + 256] = {0,};
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix by means of replacing run-time length calculation with a compile-time calculation.

@ivangalkin
Fix compile error error about array initialization
66d3560 
g++ -Wall -Werror -g main.cpp DialServer.cpp DialDiscovery.cpp DialConformance.cpp DialClientInput.cpp   -ldl -lpthread -lcurl -lz -lcrypto -lssl -o dialclient
DialDiscovery.cpp:317:19: error: variable-sized object may not be initialized
    char send_buf[strlen((char*)ssdp_msearch) + INET_ADDRSTRLEN + 256] = {0,};
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
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