Avoid warnings.
diff --git a/ssl/s3_pkt.c b/ssl/s3_pkt.c
index 016af31..4a19509 100644
--- a/ssl/s3_pkt.c
+++ b/ssl/s3_pkt.c
@@ -1016,7 +1016,7 @@
 		 * does not get sent due to non-blocking IO, we will
 		 * not worry too much. */
 		if (s->s3->send_alert[0] == SSL3_AL_FATAL)
-			BIO_flush(s->wbio);
+			(void)BIO_flush(s->wbio);
 
 		if (s->info_callback != NULL)
 			cb=s->info_callback;