FYI: error.c: correct printf-style format: %d -> %u

[Jim Meyering]

I've just pushed the attached, to avoid this warning:

  lib/error.c:385:40: warning: format '%d' expects argument of type
'int', but argument 4 has type 'unsigned int' [-Wformat=]
     fprintf (stderr, file_name != NULL ? "%s:%d: " : " ",

0001-error.c-correct-printf-style-format-d-u.patch
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