Fix GCS

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/google.golang.org/grpc/transport/control.go

@@ -37,7 +37,7 @@ import (
 	"fmt"
 	"sync"
 
-	"github.com/bradfitz/http2"
+	"golang.org/x/net/http2"
 )
 
 const (
@@ -61,8 +61,8 @@ func (windowUpdate) isItem() bool {
 }
 
 type settings struct {
-	ack     bool
-	setting []http2.Setting
+	ack bool
+	ss  []http2.Setting
 }
 
 func (settings) isItem() bool {
@@ -86,7 +86,8 @@ func (flushIO) isItem() bool {
 }
 
 type ping struct {
-	ack bool
+	ack  bool
+	data [8]byte
 }
 
 func (ping) isItem() bool {
@@ -104,8 +105,14 @@ type quotaPool struct {
 
 // newQuotaPool creates a quotaPool which has quota q available to consume.
 func newQuotaPool(q int) *quotaPool {
-	qb := &quotaPool{c: make(chan int, 1)}
-	qb.c <- q
+	qb := &quotaPool{
+		c: make(chan int, 1),
+	}
+	if q > 0 {
+		qb.c <- q
+	} else {
+		qb.quota = q
+	}
 	return qb
 }