Use strlcpy for sun_paths

My understanding is that sun_path need not be nul-terminated, but I
didn't notice that SUN_LEN actually requires it.

> The length of UNIX-domain address, required by bind(2) and connect(2),
> can be calculated by the macro SUN_LEN() defined in <sys/un.h>.  The
> sun_path field must be terminated by a NUL character to be used with
> SUN_LEN(), but the terminating NUL is not part of the address.

Thanks to Duncan Overbruck <mail@duncano.de> for the report.

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