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, 4 insertions, 4 deletions

diff --git a/src/fid.c b/src/fid.c
index 24d1833..e72e820 100644
--- a/src/fid.c
+++ b/src/fid.c
@@ -71,7 +71,7 @@ usage (void)
 {
   fprintf (stderr, _("Try `%s --help' for more information.\n"),
 	   program_name);
-  exit (1);
+  exit (EXIT_FAILURE);
 }
 
 static void __attribute__((__noreturn__))
@@ -89,7 +89,7 @@ also given list the identifiers that occur in both files.\n\
       --version    output version information and exit\n\
 "));
   printf (_("\nReport bugs to " PACKAGE_BUGREPORT "\n\n"));
-  exit (0);
+  exit (EXIT_SUCCESS);
 }
 
 int
@@ -136,7 +136,7 @@ main (int argc, char **argv)
   if (show_version)
     {
       printf ("%s - %s\n", program_name, PACKAGE_VERSION);
-      exit (0);
+      exit (EXIT_SUCCESS);
     }
 
   if (show_help)
@@ -158,7 +158,7 @@ main (int argc, char **argv)
   /* Look for the ID database up the tree */
   idh.idh_file_name = locate_id_file_name (idh.idh_file_name);
   if (idh.idh_file_name == 0)
-    error (1, errno, _("can't locate `ID'"));
+    error (EXIT_FAILURE, errno, _("can't locate `ID'"));
 
   init_idh_obstacks (&idh);
   init_idh_tables (&idh);