https://github.com/cockroachdb/rocksdb/commit/92572072dc46c1c35191ca529f860fe219007fd0

From 139500df49ff6009d5098fa8e2cc0dc4e97e7c5a Mon Sep 17 00:00:00 2001
From: Raphael 'kena' Poss <knz@thaumogen.net>
Date: Wed, 1 Apr 2020 10:46:13 +0200
Subject: [PATCH] util/channel.h: remove an invalid const specifier

This error was found by Clang 10.
---
 util/channel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util/channel.h b/util/channel.h
index 0225482c00c..2eaf02d0ccd 100644
--- a/util/channel.h
+++ b/util/channel.h
@@ -31,7 +31,7 @@ class channel {
     return buffer_.empty() && eof_;
   }
 
-  size_t size() const {
+  size_t size() {
     std::lock_guard<std::mutex> lk(lock_);
     return buffer_.size();
   }