🐞 fix(tcp_reassembly_pop): oldest ptr check null

src/tcp_reassembly/tcp_reassembly.cpp

@@ -167,6 +167,8 @@ struct tcp_segment *tcp_reassembly_pop(struct tcp_reassembly *assembler)
         node = interval_tree_iter_next(node, assembler->recv_next, assembler->recv_next);
     }
 
+    if(oldest==NULL)return NULL;
+
     list_del(&oldest->lru);
     interval_tree_remove(&oldest->node, &assembler->root);