ReadMe: update some typo

src/fast_ping.c

@@ -329,6 +329,10 @@ static struct addrinfo *_fast_ping_getaddr(const char *host, const char *port, i
 	struct addrinfo hints;
 	struct addrinfo *result = NULL;
 	int errcode = 0;
+	
+	if (host == NULL || port == NULL) {
+		goto errout;
+	}
 
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = AF_UNSPEC;