message: Surface validateHKDFStreamingPRFParams() error to user as it's more descriptive.
diff: @@ -18,7 +18,6 @@ package streamingprf
  import (
  "errors"
  - "fmt"
  "google.golang.org/protobuf/proto"
  "github.com/google/tink/go/core/registry"
  @@ -65,9 +64,6 @@ func (km *hkdfStreamingPRFKeyManager) NewKey(serializedKeyFormat []byte) (proto.
  if err := proto.Unmarshal(serializedKeyFormat, keyFormat); err != nil {
  return nil, errInvalidHKDFStreamingPRFKeyFormat
  }
  - if keyFormat.GetParams() == nil {
  - return nil, fmt.Errorf("nil HKDF PRF params")
  - }
  if err := validateHKDFStreamingPRFParams(hashNameFromHKDFPRFParams(keyFormat.GetParams()), int(keyFormat.GetKeySize())); err != nil {
  return nil, err
  }
  