fix(network): remove buffer

Remove an unneccessary buffer based on an upstream fix - see bitswap/103

network/libp2p_impl.go

 package network
 
 import (
-	"bufio"
 	"context"
 	"fmt"
 	"io"
@@ -64,11 +63,9 @@ func msgToStream(ctx context.Context, s inet.Stream, msg gsmsg.GraphSyncMessage)
 		log.Warningf("error setting deadline: %s", err)
 	}
 
-	w := bufio.NewWriter(s)
-
 	switch s.Protocol() {
 	case ProtocolGraphsync:
-		if err := msg.ToNet(w); err != nil {
+		if err := msg.ToNet(s); err != nil {
 			log.Debugf("error: %s", err)
 			return err
 		}
@@ -76,11 +73,6 @@ func msgToStream(ctx context.Context, s inet.Stream, msg gsmsg.GraphSyncMessage)
 		return fmt.Errorf("unrecognized protocol on remote: %s", s.Protocol())
 	}
 
-	if err := w.Flush(); err != nil {
-		log.Debugf("error: %s", err)
-		return err
-	}
-
 	if err := s.SetWriteDeadline(time.Time{}); err != nil {
 		log.Warningf("error resetting deadline: %s", err)
 	}