Avoid warning on empty expressions

For some reason, Q_UNUSED includes already a semicolon, adding one
on the user side creates an additional empty statement.

Change-Id: I9c5e8fac381345a60792cb75e2938fd53958d3b0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/cplusplus/ResolveExpression.cpp

@@ -963,8 +963,8 @@ bool ResolveExpression::visit(ArrayAccessAST *ast)
 
 QList<LookupItem> ResolveExpression::getMembers(ClassOrNamespace *binding, const Name *memberName) const
 {
-    Q_UNUSED(binding);
-    Q_UNUSED(memberName);
+    Q_UNUSED(binding)
+    Q_UNUSED(memberName)
 
     // ### port me
     QList<LookupItem> members;