0da2bb7414
get_pretty_hostname() so far had semantics not in line with our usual ones: the return parameter was actually freed before the return string written into it, because that's what parse_env_file() does. Moreover, when the value was not set it would return NULL but succeed. Let's normalize this, and only fill in the return value if there's something set, and never read from it, like we usually do with return parameter, and in particular those named "ret_xyz". The existing callers don't really care about the differences, but it's nicer to normalize behaviour to minimize surprises.
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