From c61b09dedc3a7e9112fc937fb9d3529e8550c274 Mon Sep 17 00:00:00 2001
From: XANTRONIX Development <dev@xantronix.com>
Date: Fri, 31 Jul 2020 01:08:43 -0400
Subject: [PATCH] Only use TX slot for outgoing I frames

In patty_ax25_sock_send(), only use a numbered TX slot in the ring
buffer when sending I frames, rather than the prior case when the frame
was not a U frame
---
 src/sock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/sock.c b/src/sock.c
index 65024b9..dc6f3a6 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -390,8 +390,8 @@ ssize_t patty_ax25_sock_send(patty_ax25_sock *sock,
      size_t offset = 0;
     ssize_t encoded;
 
-    uint8_t *buf = PATTY_AX25_FRAME_CONTROL_U(control)?
-        sock->tx_buf: tx_slot(sock, sock->seq_send);
+    uint8_t *buf = PATTY_AX25_FRAME_CONTROL_I(control)?
+        tx_slot(sock, sock->seq_send): sock->tx_buf;
 
     if (sock->iface == NULL) {
         errno = ENETDOWN;