remove unnecessary seed

Signed-off-by: Lixia (Sylvia) Lei <[email protected]>

registry/remote/retry/policy.go

@@ -94,9 +94,9 @@ type Backoff func(attempt int, resp *http.Response) time.Duration
 // value is used as the backoff duration.
 func ExponentialBackoff(backoff time.Duration, factor, jitter float64) Backoff {
 	return func(attempt int, resp *http.Response) time.Duration {
-		hashSeed := seedFromMapHash()
-		timeSeed := uint64(time.Now().UnixNano())
-		rand := rand.New(rand.NewPCG(hashSeed, timeSeed))
+		var h maphash.Hash
+		h.SetSeed(maphash.MakeSeed())
+		rand := rand.New(rand.NewPCG(h.Sum64(), 0))
 
 		// check Retry-After
 		if resp != nil && resp.StatusCode == http.StatusTooManyRequests {
@@ -113,13 +113,6 @@ func ExponentialBackoff(backoff time.Duration, factor, jitter float64) Backoff {
 	}
 }
 
-// seedFromMapHash returns a seed generated by maphash.
-func seedFromMapHash() uint64 {
-	var h maphash.Hash
-	h.SetSeed(maphash.MakeSeed())
-	return h.Sum64()
-}
-
 // GenericPolicy is a generic retry policy.
 type GenericPolicy struct {
 	// Retryable is a predicate that returns true if the request should be