remove vote instruction return value

Author: neo hong

libsolidity/analysis/GlobalContext.cpp

@@ -510,19 +510,17 @@ void GlobalContext::addValidateMultiSignMethod() {
 }
 
 void GlobalContext::addVoteMethod() {
-	// bool vote(address[] memory addresses, unit256[] tronpowerlist)
+	// void vote(address[] memory addresses, unit256[] tronpowerlist)
 	TypePointers parameterTypes;
 
 	parameterTypes.push_back(TypeProvider::array(DataLocation::Memory, TypeProvider::address()));
 	parameterTypes.push_back(TypeProvider::array(DataLocation::Memory, TypeProvider::uint256()));
 
 	TypePointers returnParameterTypes;
-	returnParameterTypes.push_back(TypeProvider::boolean());
 	strings parameterNames;
 	parameterNames.push_back("srList");
 	parameterNames.push_back("tronpowerList");
 	strings returnParameterNames;
-	returnParameterNames.push_back("ok");
 
 	m_magicVariables.push_back(make_shared<MagicVariableDeclaration>(magicVariableToID("vote"), "vote", TypeProvider::function(
 		parameterTypes,

libsolidity/codegen/ExpressionCompiler.cpp

@@ -1469,7 +1469,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 				m_context << Instruction::DUP1 << Instruction::MLOAD;
 			}
 			m_context << Instruction::NATIVEVOTE;
-			m_context << Instruction::DUP1 << Instruction::ISZERO;
+			m_context << Instruction::ISZERO;
 			m_context.appendConditionalRevert(true);
 			break;
 		}