Pull request 2039: 6304-fix-ring-buffer

Updates #6304.

Squashed commit of the following:

commit 7382630404cf18ff45e54234134c192161f5d94a
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Oct 12 19:37:01 2023 +0300

    all: upd chlog

commit ff9a82a6872f3bd93fe89956c5441429c189bce7
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Oct 12 19:27:35 2023 +0300

    querylog: fix ring buffer

CHANGELOG.md

@@ -23,6 +23,12 @@ See also the [v0.107.40 GitHub milestone][ms-v0.107.40].
 NOTE: Add new changes BELOW THIS COMMENT.
 -->
 
+### Fixed
+
+- Panic on clearing query log ([#6304]).
+
+[#6304]: https://github.com/AdguardTeam/AdGuardHome/issues/6304
+
 <!--
 NOTE: Add new changes ABOVE THIS COMMENT.
 -->

internal/querylog/qlog.go

@@ -139,7 +139,7 @@ func (l *queryLog) clear() {
 		l.bufferLock.Lock()
 		defer l.bufferLock.Unlock()
 
-		l.buffer = nil
+		l.buffer.Clear()
 		l.flushPending = false
 	}()