build: accommodate new syntax-check test

Use EXIT_FAILURE and EXIT_SUCCESS, not 1 and 0.
Apply these commands:
perl -pi -e 's/\berror \(1,/error (EXIT_FAILURE,/' \
  $(git grep -l '\<error (1,')
perl -pi -e 's/\bexit \(1\)/exit (EXIT_FAILURE)/' \
  $(git grep -l '\<exit (1)')
perl -pi -e 's/\bexit \(0\)/exit (EXIT_SUCCESS)/' \
  $(git grep -l '\<exit (0)')
* libidu/idread.c (read_id_file, maybe_read_id_file, io_read):
* libidu/idu-hash.c (hash_init):
* libidu/idwrite.c (io_write):
* libidu/scanners.c (parse_language_map, parse_language_map_file):
(read_language_map_file):
* libidu/walker.c (include_languages, exclude_languages):
(get_current_dir_link):
* src/fid.c (usage, help_me, main):
* src/fnid.c (usage, help_me, main):
* src/lid.c (usage, help_me, main, report_grep, report_edit):
(query_regexp):
* src/mkid.c (main, assert_writeable, write_id_file):
* src/xtokid.c (help_me):

1 files changed, 1 insertions, 1 deletions

diff --git a/src/xtokid.c b/src/xtokid.c
index 8c0b906..cff5a08 100644
--- a/src/xtokid.c
+++ b/src/xtokid.c
@@ -103,7 +103,7 @@ The following arguments apply to the language-specific scanners:\n\
 "));
   language_help_me ();
   printf (_("\nReport bugs to " PACKAGE_BUGREPORT "\n\n"));
-  exit (0);
+  exit (EXIT_SUCCESS);
 }
 
 int