fixed some memory leak

util.cpp

@@ -275,14 +275,15 @@ namespace net
 				if (cur_ifname == ifname && cur->ifa_addr && cur->ifa_addr->sa_family == af)
 				{
 					// match
-          char * addr = new char[INET6_ADDRSTRLEN];
-          bzero(addr, INET6_ADDRSTRLEN);
-          if(af == AF_INET)
-            inet_ntop(af, &((sockaddr_in *)cur->ifa_addr)->sin_addr, addr, INET6_ADDRSTRLEN);
-          else
-            inet_ntop(af, &((sockaddr_in6 *)cur->ifa_addr)->sin6_addr, addr, INET6_ADDRSTRLEN);
-          freeifaddrs(addrs);
-          std::string cur_ifaddr(addr);
+					char * addr = new char[INET6_ADDRSTRLEN];
+					bzero(addr, INET6_ADDRSTRLEN);
+					if(af == AF_INET)
+						inet_ntop(af, &((sockaddr_in *)cur->ifa_addr)->sin_addr, addr, INET6_ADDRSTRLEN);
+					else
+						inet_ntop(af, &((sockaddr_in6 *)cur->ifa_addr)->sin6_addr, addr, INET6_ADDRSTRLEN);
+					freeifaddrs(addrs);
+					std::string cur_ifaddr(addr);
+					delete[] addr;
 					return boost::asio::ip::address::from_string(cur_ifaddr);
 				}
 				cur = cur->ifa_next;