illumos gate

This omission is easy to fix, although testing it won't be so easy. Is it worth fixing? The protoString function is part of basic networking, also known as UUCP. I suspect that the number of people using UUCP is vanishingly small. The function is only called indirectly by the uucico command. A single small memory leak here won't make any difference to its operation. I'd leave it alone.