hostname-util: add relax parameter to hostname_is_valid

Tests are modified to check behaviour with relax and without relax.
New tests are added for hostname_cleanup().
Tests are moved a new file (test-hostname-util) because there's
now a bunch of them.

New parameter is not used anywhere, except in tests, so there should
be no observable change.

1 files changed, 0 insertions, 5 deletions

diff --git a/src/locale/localed.c b/src/locale/localed.c
index 88756542fd..3b511bfaf4 100644
--- a/src/locale/localed.c
+++ b/src/locale/localed.c
@@ -99,11 +99,6 @@ static const char* nonempty(const char *s) {
         return isempty(s) ? NULL : s;
 }
 
-static void free_and_replace(char **s, char *v) {
-        free(*s);
-        *s = v;
-}
-
 static bool startswith_comma(const char *s, const char *prefix) {
         const char *t;