Invalid free in luac 5.4.4

[Kurt Jung <kurt.w.jung@...>]

When compiling multiple Lua files with luac (5.4.4) on Ubuntu I
encounter the following:

> free(): double free detected in tcache 2
> Aborted

I think this happens because of the line

> luaM_freearray(L,f->lineinfo,f->sizelineinfo);

in the combine() function of luac.c. At least, when that line is
commented, valgrind reports no errors and no unfreed memory.

-- Kurt Jung