docs: add FD_ZERO to curl_multi_fdset example#16325
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While the examples are not intended to complete applications this is quite relevant for the correct function of the code.
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While the examples are not intended to complete applications this is quite relevant for the correct function of the code. Closes curl#16325
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Minor improvement to the inlined
curl_multi_fdsetexample. While the inline code examples aren't supposed to be full apps it might be a good idea to have at least theFD_ZEROin place. Of course full app using thecurl_multi_fdsetwould likely also add their own fds to the set(s), too (since this is likely the main reason to use the function to begin with).