Discard data in splice pair when returning to pool.

splice/pool.go

 package splice
 
 import (
+	"io"
 	"sync"
 )
 
@@ -62,10 +63,21 @@ func (me *pairPool) get() (p *Pair, err error) {
 	return newSplicePair()
 }
 
+func DiscardAll(r io.Reader) {
+	buf := make([]byte, 32*1024)
+	for {
+		n, _ := r.Read(buf)
+		if n < len(buf) {
+			break
+		}
+	}
+}
+
 func (me *pairPool) done(p *Pair) {
 	me.Lock()
 	defer me.Unlock()
 
+	DiscardAll(p.r)
 	me.usedCount--
 	me.unused = append(me.unused, p)
 }