Cover multicast report backpressure, chunking and timer cleanup

src/routing_layer/multicast.c

@@ -304,7 +304,11 @@ static void mc_loss(struct multicast_ctx* ctx, const struct mc_packet* p, uint64
         *tail = window; ctx->stats.report_bytes += sizeof(*window);
     }
     struct mc_report* r = u_calloc(1, bytes);
-    if (!r) { DEBUG_ERROR(MC_CAT, "multicast loss allocation failed bytes=%zu", bytes); return; }
+    if (!r) {
+        DEBUG_ERROR(MC_CAT, "multicast loss allocation failed bytes=%zu", bytes);
+        mc_report_schedule(ctx); /* Созданное окно должно истечь даже при отказе выделения отчёта. */
+        return;
+    }
     r->ctx = ctx; r->due = due; r->retry = due;
     r->loss = (struct multicast_loss){ .group_id = p->group, .source_node_id = p->source,
         .src = ctx->inst->node_id, .dst = dst, .descriptor = p->descriptor, .recipient_count = count,