Fix Lua compile warning on GCC 12.1 (#11115)
Fix Lua compile warning on GCC 12.1 GCC 12.1 prints a warning on compile: ``` ldump.c: In function ‘DumpString’: ldump.c:63:26: warning: the comparison will always evaluate as ‘false’ for the pointer operand in ‘s + 24’ must not be NULL [-Waddress] 63 | if (s==NULL || getstr(s)==NULL) ``` It seems correct, `getstr(s)` can't be `NULL`. Also, I see Lua v5.2 does not have that check: https://github.com/lua/lua/blob/v5-2/ldump.c#L63
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