modules/log: remove noop written variables (#10182)

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

modules/log/conn_test.go

 }
 
 func TestConnLogger(t *testing.T) {
-	var written []byte
-
 	protocol := "tcp"
 	address := ":3099"
 
 	}()
 	wg.Wait()
 
-	written = written[:0]
-
 	event.level = WARN
 	expected = fmt.Sprintf("%s%s %s:%d:%s [%c] %s\n", prefix, dateString, event.filename, event.line, event.caller, strings.ToUpper(event.level.String())[0], event.msg)
 	wg.Add(2)
 }
 
 func TestConnLoggerClose(t *testing.T) {
-	var written []byte
-
 	protocol := "tcp"
 	address := ":3099"
 
 	assert.Equal(t, level, connLogger.Level)
 	assert.Equal(t, level, logger.GetLevel())
 
-	written = written[:0]
-
 	event.level = WARN
 	expected = fmt.Sprintf("%s%s %s:%d:%s [%c] %s\n", prefix, dateString, event.filename, event.line, event.caller, strings.ToUpper(event.level.String())[0], event.msg)
 	wg.Add(2)