Internals: Cleanup some missing VL_RESTORERs. No functional change intended.

src/V3Case.cpp

@@ -72,13 +72,13 @@ class CaseLintVisitor final : public VNVisitorConst {
 
         // Check for X/Z in non-casex statements
         {
+            VL_RESTORER(m_caseExprp);
             m_caseExprp = nodep;
             iterateConst(nodep->exprp());
             for (AstCaseItem* itemp = nodep->itemsp(); itemp;
                  itemp = VN_AS(itemp->nextp(), CaseItem)) {
                 iterateAndNextConstNull(itemp->condsp());
             }
-            m_caseExprp = nullptr;
         }
     }
     void visit(AstConst* nodep) override {