core/types: fix problem decoding short typed tx

If kind == rlp.Byte, the size reported by Stream.Kind will be zero, but we need a buffer
of size 1 for ReadBytes. Since typed txs always have to be longer than 1 byte, we can just
return an error for kind == rlp.Byte.

core/types/receipt.go

@@ -165,6 +165,8 @@ func (r *Receipt) DecodeRLP(s *rlp.Stream) error {
 		}
 		r.Type = LegacyTxType
 		return r.setFromRLP(dec)
+	case kind == rlp.Byte:
+		return errShortTypedReceipt
 	default:
 		// It's an EIP-2718 typed tx receipt.
 		b, buf, err := getPooledBuffer(size)

core/types/transaction.go

@@ -145,6 +145,8 @@ func (tx *Transaction) DecodeRLP(s *rlp.Stream) error {
 			tx.setDecoded(&inner, rlp.ListSize(size))
 		}
 		return err
+	case kind == rlp.Byte:
+		return errShortTypedTx
 	default:
 		// It's an EIP-2718 typed TX envelope.
 		// First read the tx payload bytes into a temporary buffer.