tree-wide: "<n>bit" → "<n>-bit"

In some places, "<n> bits" is used when more appropriate.

src/nspawn/nspawn.c

@@ -1393,7 +1393,7 @@ static int parse_argv(int argc, char *argv[]) {
                         if (r < 0)
                                 return log_error_errno(r, "Failed to parse root hash: %s", optarg);
                         if (l < sizeof(sd_id128_t))
-                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128bit long: %s", optarg);
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Root hash must be at least 128-bit long: %s", optarg);
 
                         free_and_replace(arg_verity_settings.root_hash, k);
                         arg_verity_settings.root_hash_size = l;