Warning fix.

ECDSA recover fix.

libethereum/State.cpp

@@ -54,7 +54,7 @@ void ecrecoverCode(bytesConstRef _in, bytesRef _out)
 	memcpy(&in, _in.data(), min(_in.size(), sizeof(in)));
 
 	memset(_out.data(), 0, _out.size());
-	if (in.v > 28)
+	if ((u256)in.v > 28)
 		return;
 	SignatureStruct sig{in.r, in.s, (byte)((int)(u256)in.v - 27)};
 	if (!sig.isValid())

libsolidity/ExpressionCompiler.cpp

@@ -363,7 +363,7 @@ void ExpressionCompiler::endVisit(Identifier& _identifier)
 		m_context << m_context.getFunctionEntryLabel(*functionDef).pushTag();
 		return;
 	}
-	if (VariableDeclaration* varDef = dynamic_cast<VariableDeclaration*>(declaration))
+	if (/*VariableDeclaration* varDef = */dynamic_cast<VariableDeclaration*>(declaration))
 	{
 		m_currentLValue.fromIdentifier(_identifier, *_identifier.getReferencedDeclaration());
 		m_currentLValue.retrieveValueIfLValueNotRequested(_identifier);