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, 3 insertions, 3 deletions

diff --git a/libidu/walker.c b/libidu/walker.c
index 5fe2bf4..4093958 100644
--- a/libidu/walker.c
+++ b/libidu/walker.c
@@ -503,7 +503,7 @@ void
 include_languages (char *lang_names)
 {
   if (langs_excluded)
-    error (1, 0, _("can't mix --include and --exclude options"));
+    error (EXIT_FAILURE, 0, _("can't mix --include and --exclude options"));
   langs_included = append_strings_to_vector (langs_included, lang_names, white_space);
 }
 
@@ -511,7 +511,7 @@ void
 exclude_languages (char *lang_names)
 {
   if (langs_excluded)
-    error (1, 0, _("can't mix --include and --exclude options"));
+    error (EXIT_FAILURE, 0, _("can't mix --include and --exclude options"));
   langs_excluded = append_strings_to_vector (langs_excluded, lang_names, white_space);
 }
 
@@ -621,7 +621,7 @@ get_current_dir_link (void)
   cwd = getenv ("PWD");
   cwd = same_as_dot (cwd) ? xstrdup (cwd) : xgetcwd ();
   if (cwd == NULL)
-    error (1, errno, _("can't get working directory"));
+    error (EXIT_FAILURE, errno, _("can't get working directory"));
 #if HAVE_LINK
   dir_link = get_link_from_string (SLASH_STRING, 0);
   dir_link->fl_flags = (dir_link->fl_flags & ~FL_TYPE_MASK) | FL_TYPE_DIR;