[RPC] Remove deprecated addmultisigaddress return format

Author: jnewbery

src/wallet/rpcwallet.cpp

@@ -1192,10 +1192,6 @@ UniValue addmultisigaddress(const JSONRPCRequest& request)
             "  \"address\":\"multisigaddress\",    (string) The value of the new multisig address.\n"
             "  \"redeemScript\":\"script\"         (string) The string value of the hex-encoded redemption script.\n"
             "}\n"
-            "\nResult (DEPRECATED. To see this result in v0.16 instead, please start bitcoind with -deprecatedrpc=addmultisigaddress).\n"
-            "        clients should transition to the new output api before upgrading to v0.17.\n"
-            "\"address\"                         (string) A bitcoin address associated with the keys.\n"
-
             "\nExamples:\n"
             "\nAdd a multisig address from 2 addresses\n"
             + HelpExampleCli("addmultisigaddress", "2 \"[\\\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\\\",\\\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\\\"]\"") +
@@ -1238,11 +1234,6 @@ UniValue addmultisigaddress(const JSONRPCRequest& request)
     CTxDestination dest = pwallet->AddAndGetDestinationForScript(inner, output_type);
     pwallet->SetAddressBook(dest, strAccount, "send");
 
-    // Return old style interface
-    if (IsDeprecatedRPCEnabled("addmultisigaddress")) {
-        return EncodeDestination(dest);
-    }
-
     UniValue result(UniValue::VOBJ);
     result.pushKV("address", EncodeDestination(dest));
     result.pushKV("redeemScript", HexStr(inner.begin(), inner.end()));