[Simh] Segfault on DZ emulation for PDP-11

[Michael Richter]

If you enable the DZ terminal multiplexer and do "set dz log=0=./0.log"
without attaching you get a segfault as of the github 43e5647e release.
 This occurs on Linux Mint 15, 64-bit edition.  I think the emulator should
either just record logging *intent* here pending an attachment or it should
give an error like the ubiquitous "Invalid argument" instead of crashing.
 ;)

-- 
"Perhaps people don't believe this, but throughout all of the discussions
of entering China our focus has really been what's best for the Chinese
people. It's not been about our revenue or profit or whatnot."
--Sergey Brin, demonstrating the emptiness of the "don't be evil" mantra.
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