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

[Martine Lenders]

@miri64 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);

`per_frag` is derived from `pkt`, so I don't think that is necessary. A subscriber would then only get duplicate messages:

https://github.com/RIOT-OS/RIOT/blob/3234b918e361d273b9cfef3c123653b174f0abc0/sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c#L112-L127

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