rpcwallet: add 'ischange' field to 'getaddressinfo' response

src/wallet/wallet.cpp

@@ -1261,6 +1261,11 @@ CAmount CWallet::GetCredit(const CTxOut& txout, const isminefilter& filter) cons
 }
 
 bool CWallet::IsChange(const CTxOut& txout) const
+{
+    return IsChange(txout.scriptPubKey);
+}
+
+bool CWallet::IsChange(const CScript& script) const
 {
     // TODO: fix handling of 'change' outputs. The assumption is that any
     // payment to a script that is ours, but is not in the address book
@@ -1269,10 +1274,10 @@ bool CWallet::IsChange(const CTxOut& txout) const
     // a better way of identifying which outputs are 'the send' and which are
     // 'the change' will need to be implemented (maybe extend CWalletTx to remember
     // which output, if any, was change).
-    if (::IsMine(*this, txout.scriptPubKey))
+    if (::IsMine(*this, script))
     {
         CTxDestination address;
-        if (!ExtractDestination(txout.scriptPubKey, address))
+        if (!ExtractDestination(script, address))
             return true;
 
         LOCK(cs_wallet);