dirauth: reorder the checks in dirserv_router_has_valid_address()

To avoid a bug warning.

Fixes 31793. Bug not in any release, no changes file required.

src/feature/dirauth/process_descs.c

@@ -432,20 +432,22 @@ STATIC int
 dirserv_router_has_valid_address(routerinfo_t *ri)
 {
   tor_addr_t addr;
+
   if (get_options()->DirAllowPrivateAddresses)
     return 0; /* whatever it is, we're fine with it */
-  tor_addr_from_ipv4h(&addr, ri->addr);
 
-  if (tor_addr_is_internal(&addr, 0) || tor_addr_is_null(&addr)) {
+  tor_addr_from_ipv4h(&addr, ri->addr);
+  if (tor_addr_is_null(&addr) || tor_addr_is_internal(&addr, 0)) {
     log_info(LD_DIRSERV,
              "Router %s published internal IPv4 address. Refusing.",
              router_describe(ri));
     return -1; /* it's a private IP, we should reject it */
   }
+
   /* We only check internal v6 on non-null addresses because we do not require
    * IPv6 and null IPv6 is normal. */
-  if (tor_addr_is_internal(&ri->ipv6_addr, 0) &&
-      !tor_addr_is_null(&ri->ipv6_addr)) {
+  if (!tor_addr_is_null(&ri->ipv6_addr) &&
+      tor_addr_is_internal(&ri->ipv6_addr, 0)) {
     log_info(LD_DIRSERV,
              "Router %s published internal IPv6 address. Refusing.",
              router_describe(ri));