The default chainHash is 00000s not nil, so instead we check against …

…nil here.

Signed-off-by: Darren Kellenschwiler <d.kellenschwiler@bsvblockchain.org>

merkleroot.go

@@ -145,12 +145,12 @@ func BuildMerkleTreeStoreChainHash(txids []*chainhash.Hash) ([]*chainhash.Hash,
 	for i := 0; i < arraySize-1; i += 2 {
 		switch {
 		// When there is no left child node, the parent is nil ("") too.
-		case merkles[i].IsEqual(&chainhash.Hash{}):
-			merkles[offset] = &chainhash.Hash{}
+		case merkles[i].IsEqual(nil):
+			merkles[offset] = nil
 
 			// When there is no right child, the parent is generated by
 			// hashing the concatenation of the left child with itself.
-		case merkles[i+1].IsEqual(&chainhash.Hash{}):
+		case merkles[i+1].IsEqual(nil):
 			merkles[offset] = MerkleTreeParentBytes(merkles[i], merkles[i])
 
 			// The normal case sets the parent node to the double sha256