minor fix

src/civetweb.c

@@ -1440,7 +1440,7 @@ static void sockaddr_to_string(char *buf, size_t len, const union usa *usa)
 	buf[0] = '\0';
 
 	if (!usa) {
-		return NULL;
+		return;
 	}
 	
 	if (usa->sa.sa_family == AF_INET) {