Flush stdout when expecting user input on stdin.

src/utils_tools.c

@@ -143,6 +143,7 @@ int yesDialog(const char *msg, void *usrptr __attribute__((unused)))
 	if(isatty(STDIN_FILENO) && !opt_batch_mode) {
 		log_std("\nWARNING!\n========\n");
 		log_std("%s\n\nAre you sure? (Type uppercase yes): ", msg);
+		fflush(stdout);
 		if(getline(&answer, &size, stdin) == -1) {
 			r = 0;
 			/* Aborted by signal */