Bug report : (lstring.c:210) (ts)->shrlen != 0xFF

[云风 Cloud Wu <cloudwu@...>]

I updated lua source from https://github.com/lua/lua today, and my
project crashed.

I found the TString is not initialized before getshrstr().

https://github.com/lua/lua/blob/master/lstring.c#L209-L211

I think it should be :

  ts = createstrobj(L, l, LUA_VSHRSTR, h);
  ts->shrlen = cast_byte(l);
  memcpy(getshrstr(ts), str, l * sizeof(char));

The `ts->shrlen` should be initialized before memcpy().

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