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

[benpicco]

@benpicco commented on this pull request.



> @@ -291,13 +300,13 @@ static void _snd_buf_del(gnrc_ipv6_ext_frag_send_t *snd_buf)
     snd_buf->pkt = NULL;
 }
 
-static void _snd_buf_free(gnrc_ipv6_ext_frag_send_t *snd_buf)
+static void _snd_buf_free(gnrc_ipv6_ext_frag_send_t *snd_buf, int errno)
 {
     if (snd_buf->per_frag) {
         gnrc_pktbuf_release(snd_buf->per_frag);

Should we also use `gnrc_pktbuf_release_error()` here?

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