Extract the path from an AF_LOCAL sockaddr_un in a way that correctly terminates the string in all cases, based on code from netstat(1). The path in a sockaddr_un is terminated either by a '\0', or by the end of the sockaddr as defined by sun_len.
Extract the path from an AF_LOCAL sockaddr_un in a way that correctly
terminates the string in all cases, based on code from netstat(1).
The path in a sockaddr_un is terminated either by a '\0', or by
the end of the sockaddr as defined by sun_len.

Previously, the code could write the "safety" '\0' beyond the end
of the sockaddr (sockaddr_un's need only be large enough to store
sun_len bytes), and writing into the the supplied sockaddr is bad
anyway.

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