Merge bitcoin#32771: contrib: tracing: Fix read of pmsg_type in p2p_monitor.py

3473986 contrib: tracing: Correctly read msg type in p2p_monitor.py (David Gumberg)

Pull request description:

  This fixes a bug in the contrib tracing script `p2p_monitor.py`. currently the script fails to read the `msg_type` of inbound and outbound messages, which is useful in the per-peer message view.

  <details>
  <summary>Screenshot of p2p_monitor.py on master</summary>

  ![Screenshot From 2025-06-18 11-37-43](https://github.com/user-attachments/assets/56612088-54d7-465c-b0b6-1b425b919785)
  </details>

  <details>
  <summary>Screenshot of p2p_monitor.py on this branch</summary>

  ![Screenshot From 2025-06-18 11-41-38](https://github.com/user-attachments/assets/4438a483-938c-450b-a12e-6d6909b2c37e)

  </details>

ACKs for top commit:
  yuvicc:
    ACK 3473986
  janb84:
    ut ACK 3473986
  0xB10C:
    ACK 3473986

Tree-SHA512: 94da0dc35072933a20ef693024855b3c382fc6f5ae0a3108d092d7aa5a4004df478f5de07b80f675be13e00f3f4596b0f34c49ec1d8d2c38a15797dcf86c2a56

Author: fanquake

contrib/tracing/p2p_monitor.py

@@ -54,7 +54,7 @@
     bpf_probe_read_user_str(&msg.peer_addr, sizeof(msg.peer_addr), paddr);
     bpf_usdt_readarg(3, ctx, &pconn_type);
     bpf_probe_read_user_str(&msg.peer_conn_type, sizeof(msg.peer_conn_type), pconn_type);
-    bpf_usdt_readarg(4, ctx, &pconn_type);
+    bpf_usdt_readarg(4, ctx, &pmsg_type);
     bpf_probe_read_user_str(&msg.msg_type, sizeof(msg.msg_type), pmsg_type);
     bpf_usdt_readarg(5, ctx, &msg.msg_size);
 
@@ -71,7 +71,7 @@
     bpf_probe_read_user_str(&msg.peer_addr, sizeof(msg.peer_addr), paddr);
     bpf_usdt_readarg(3, ctx, &pconn_type);
     bpf_probe_read_user_str(&msg.peer_conn_type, sizeof(msg.peer_conn_type), pconn_type);
-    bpf_usdt_readarg(4, ctx, &pconn_type);
+    bpf_usdt_readarg(4, ctx, &pmsg_type);
     bpf_probe_read_user_str(&msg.msg_type, sizeof(msg.msg_type), pmsg_type);
     bpf_usdt_readarg(5, ctx, &msg.msg_size);