rpc: fix inappropriate warning for address type p2sh-segwit in createmultisig and addmultisigaddress

src/rpc/output_script.cpp

@@ -163,11 +163,11 @@ static RPCHelpMan createmultisig()
             result.pushKV("descriptor", descriptor->ToString());
 
             UniValue warnings(UniValue::VARR);
-            if (!request.params[2].isNull() && OutputTypeFromDestination(dest) != output_type) {
+            if (descriptor->GetOutputType() != output_type) {
                 // Only warns if the user has explicitly chosen an address type we cannot generate
                 warnings.push_back("Unable to make chosen address type, please ensure no uncompressed public keys are present.");
             }
-            if (warnings.size()) result.pushKV("warnings", warnings);
+            if (!warnings.empty()) result.pushKV("warnings", warnings);
 
             return result;
         },

src/wallet/rpc/addresses.cpp

@@ -302,11 +302,11 @@ RPCHelpMan addmultisigaddress()
     result.pushKV("descriptor", descriptor->ToString());
 
     UniValue warnings(UniValue::VARR);
-    if (!request.params[3].isNull() && OutputTypeFromDestination(dest) != output_type) {
+    if (descriptor->GetOutputType() != output_type) {
         // Only warns if the user has explicitly chosen an address type we cannot generate
         warnings.push_back("Unable to make chosen address type, please ensure no uncompressed public keys are present.");
     }
-    if (warnings.size()) result.pushKV("warnings", warnings);
+    if (!warnings.empty()) result.pushKV("warnings", warnings);
 
     return result;
 },