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> MemorySanitizer: use-of-uninitialized-value /home/mpech/lua-5.3.5/src/liolib.c:490:58 in read_line

Here is the line in question:

    while (i < LUAL_BUFFERSIZE && (c = l_getc(f)) != EOF && c != '\n')

The tool seems to think that c is uninitialized, which is clearly
wrong given this line just before the loop:

  int c = '\0';

What am I missing?