Free a BIO_ADDR if DTLSv1_listen return <=0

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/apps/s_server.c b/apps/s_server.c
index c998fcd..dce02f0 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -2481,6 +2481,8 @@
             BIO_ADDR_free(client);
             dtlslisten = 0;
             i = SSL_accept(con);
+        } else {
+            BIO_ADDR_free(client);
         }
     } else
 #endif