Dip and name prompt crashes with long (80+ char) called and individual names

[tung]

To reproduce (in wizmode):

1. Wish for any unidentified item (e.g. bag of holding).
2. #name n and give it an 80+ character object class name.
3. #name y and give it an 80+ character individual object name.
4. #name y and leave the prompt.

At this point the game crashes. It also crashes when step 4 is replaced with any action that creates a dipping prompt. UnNetHack fixes these for the name prompt (r660) and the dipping prompts (r662).