bug#22444: compiler warnings in test snapshot

[Charles Diza]

Hello,

I tested the snapshot 2.22.29-83df mentioned by Jim Meyering.  On  Mac OS X
10.11.3, I found some compiler warnings.  I'm not a programmer, so I don't
know whether they're harmless or not.  I thought I'd report them here.  I
pasted them below.

-Charles

========8<======================

 CC       fpending.o
error.c:386:12: warning: data argument not used by format string
      [-Wformat-extra-args]
           file_name, line_number);
           ^
  CC       fstatat.o
1 warning generated.

========8<======================

CC       strstr.o
In file included from regex.c:70:
./regex_internal.c:1392:11: warning: comparison of unsigned expression < 0
is
      always false [-Wtautological-compare]
  if (idx < 0 || idx >= set->nelem)
      ~~~ ^ ~