[riot-notifications] [RIOT-OS/RIOT] gnrc_pkt: port to list.h (#15342)

[Martine Lenders]

@miri64 commented on this pull request.



> +    list_node_t list = { .next = (list_node_t *)pkt };
+
+    list_remove(&list, (list_node_t *)snip);
+    return (gnrc_pktsnip_t *)list.next;

If `list` is so confusing, should I maybe replace this with

```suggestion
    if (snip == pkt) {
        return pkt->next;
    }
    else {
        gnrc_pktsnip_t *prev = gnrc_pkt_prev_snip(pkt, snip);
        
        if (prev) {
            prev->next = snip->next;
        }
        return pkt;
    }
```
?

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