84dbb3fd83
Since we don't need the error value, and the buffer is allocated with a fixed size, the whole logic provided by in_addr_to_string() becomes unnecessary, so it's enough to wrap inet_ntop() directly. inet_ntop() can only fail with ENOSPC. But we specify a buffer that is supposed to be large enough, so this should never fail. A bunch of tests of this are added. This allows all the wrappers like strna(), strnull(), strempty() to be dropped. The guard of 'if (DEBUG_LOGGING)' can be dropped from around log_debug(), because log_debug() implements the check outside of the function call. But log_link_debug() does not, so it we need it to avoid unnecessary evaluation of the formatting.
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