Minor fixes

log/default.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"time"
 
+	"github.com/sagernet/sing/common"
 	F "github.com/sagernet/sing/common/format"
 )
 
@@ -41,6 +42,10 @@ func (f *simpleFactory) NewLogger(tag string) ContextLogger {
 	return &simpleLogger{f, tag}
 }
 
+func (f *simpleFactory) Close() error {
+	return common.Close(f.writer)
+}
+
 var _ ContextLogger = (*simpleLogger)(nil)
 
 type simpleLogger struct {