-static inline const char *
-ng_ipaddr_tostr(const ng_ipaddr_t *addr) { return inet_ntoa(addr->sin4.sin_addr); }
+static inline const char*
+ng_ipaddr_tostr(const ng_ipaddr_t *addr)
+{
+ assert(addr != NULL);
+ return inet_ntoa(addr->sin4.sin_addr);
+}