[riot-notifications] [RIOT-OS/RIOT] gnrc_netif_pkq: fix pktbuf leak (#15435)

[José Alamos]

@jia200x commented on this pull request.



> @@ -1521,6 +1521,9 @@ static void _send(gnrc_netif_t *netif, gnrc_pktsnip_t *pkt, bool push_back)
         }
         else {
             LOG_ERROR("gnrc_netif: can't queue packet for sending\n");
+            /* If we got here, it means the device was busy and the pkt queue
+             * was full. The packet should be dropped here anyway */
+            gnrc_pktbuf_release(pkt);

ENOMEM makes more sense to me

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