Maybe a bug in lundump.c

[云风 <cloudwu@...>]

In function : void LoadConstants(LoadState* S, Proto* f)

If the constant is string, it will be call setsvalue2n .

case LUA_TSTRING:
  setsvalue2n(S->L,o,LoadString(S));

and setsvalue2n  crashes if LoadString(S) return NULL.

I think if we check the return value of LoadString here would be better :

case LUA_TSTRING: {
    TString * s = LoadString(S);
    if (s) {
      setsvalue2n(S->L,o,s);
    } else {
       setnilvalue(o);
    }
    break;
}

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