Merge pull request #8257 from PeterKietzmann/pr_netif_raw_vector_release

sys/netif: include release of iovec in gnrc_netif_raw

sys/net/gnrc/netif/gnrc_netif_raw.c

@@ -100,8 +100,11 @@ static int _send(gnrc_netif_t *netif, gnrc_pktsnip_t *pkt)
         /* we don't need the netif snip: remove it */
         pkt = gnrc_pktbuf_remove_snip(pkt, pkt);
     }
+    /* prepare packet for sending */
     vector = gnrc_pktbuf_get_iovec(pkt, &n);
     if (vector != NULL) {
+        /* reassign for later release; vector is prepended to pkt */
+        pkt = vector;
         struct iovec *v = (struct iovec *)vector->data;
         netdev_t *dev = netif->dev;