tree-wide: fix use of flink_tmpfile()

Let's always make sure the temporary file returned by fopen_tmpfile()
and friends is removed on failure (via _cleanup_). Conversely, make sure
that once the file is renamed into its final place, we no longer try to
remove the temporary file (since it's not going to exist anymore).

src/shared/hwdb-util.c

@@ -409,6 +409,8 @@ static int trie_store(struct trie *trie, const char *filename, bool compat) {
         if (r < 0)
                 return r;
 
+        filename_tmp = mfree(filename_tmp);
+
         /* write succeeded */
 
         log_debug("=== trie on-disk ===");