update clang sharedvisitor.cxx

This should have been included in 9fbedb792993.

Change-Id: I3b8b1a463c3f85d6cd4a4db14edcfedf01d7e5a9
Reviewed-on: https://gerrit.libreoffice.org/74956
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
diff --git a/compilerplugins/clang/sharedvisitor/sharedvisitor.cxx b/compilerplugins/clang/sharedvisitor/sharedvisitor.cxx
index 66e43b9..a6df13c 100644
--- a/compilerplugins/clang/sharedvisitor/sharedvisitor.cxx
+++ b/compilerplugins/clang/sharedvisitor/sharedvisitor.cxx
@@ -410,6 +410,11 @@ public:
    {
        if( ignoreLocation( arg ))
            return true;
        if( blockBlock != nullptr )
        {
            if( !blockBlock->VisitCaseStmt( arg ))
                blockBlock = nullptr;
        }
        if( unnecessaryParen != nullptr )
        {
            if( !unnecessaryParen->VisitCaseStmt( arg ))