[wallet] CreateTransaction: simplify change address check

Author: Sjors

src/wallet/wallet.cpp

@@ -2630,18 +2630,11 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
                 //  post-backup change.
 
                 // Reserve a new key pair from key pool
-                if (!CanGetAddresses(true)) {
-                    strFailReason = _("Can't generate a change-address key. No keys in the internal keypool and can't generate any keys.").translated;
-                    return false;
-                }
                 CTxDestination dest;
-                bool ret = reservedest.GetReservedDestination(dest, true);
-                if (!ret)
-                {
-                    strFailReason = _("Keypool ran out, please call keypoolrefill first").translated;
+                if (!reservedest.GetReservedDestination(dest, true)) {
+                    strFailReason = _("Can't generate a change-address key. Please call keypoolrefill first.").translated;
                     return false;
                 }
-
                 scriptChange = GetScriptForDestination(dest);
             }
             CTxOut change_prototype_txout(0, scriptChange);

test/functional/rpc_fundrawtransaction.py

@@ -504,7 +504,7 @@ def test_locked_wallet(self):
         rawtx = self.nodes[1].createrawtransaction(inputs, outputs)
         # fund a transaction that requires a new key for the change output
         # creating the key must be impossible because the wallet is locked
-        assert_raises_rpc_error(-4, "Keypool ran out, please call keypoolrefill first", self.nodes[1].fundrawtransaction, rawtx)
+        assert_raises_rpc_error(-4, "Can't generate a change-address key. Please call keypoolrefill first.", self.nodes[1].fundrawtransaction, rawtx)
 
         # Refill the keypool.
         self.nodes[1].walletpassphrase("test", 100)