Merge #9912: Optimize GetWitnessHash() for non-segwit transactions

02c57b5 Optimize GetWitnessHash() for non-segwit transactions (Suhas Daftuar)

Tree-SHA512: 405d07c11930f3432ae25b11232466a30ba2339be98e0fb5149934d792e014f504fedbe62b9c8e5febbbdad459bd1573ea896e527b9aa591926bbc774b895e6a

src/primitives/transaction.cpp

@@ -69,6 +69,9 @@ uint256 CTransaction::ComputeHash() const
 
 uint256 CTransaction::GetWitnessHash() const
 {
+    if (!HasWitness()) {
+        return GetHash();
+    }
     return SerializeHash(*this, SER_GETHASH, 0);
 }