[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_ext_frag: check return value of msg_try_send() (#15526)

[benpicco]

@benpicco commented on this pull request.



>  {
     if (snd_buf->per_frag) {
         gnrc_pktbuf_release(snd_buf->per_frag);
     }
     if (snd_buf->pkt) {
-        gnrc_pktbuf_release(snd_buf->pkt);
+        gnrc_pktbuf_release(snd_buf->pkt, errno);

```suggestion
        gnrc_pktbuf_release_error(snd_buf->pkt, errno);
```

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