coverity#1028600 Uninitialized scalar field

Change-Id: I0b4ee14ea2306786351ce20960a05e8f3058fb21

vcl/inc/window.h

@@ -232,7 +232,7 @@ public:
     VclPtr<vcl::Window> mpDlgCtrlDownWindow;
     std::vector<Link<VclWindowEvent&,void>> maEventListeners;
     std::vector<Link<VclWindowEvent&,void>> maChildEventListeners;
-    int maChildEventListenersIteratingCount;
+    int mnChildEventListenersIteratingCount;
     std::set<Link<VclWindowEvent&,void>> maChildEventListenersDeleted;
 
     // The canvas interface for this VCL window. Is persistent after the first GetCanvas() call

vcl/source/window/event.cxx

@@ -245,11 +245,11 @@ void Window::CallEventListeners( sal_uLong nEvent, void* pData )
             // Copy the list, because this can be destroyed when calling a Link...
             std::vector<Link<VclWindowEvent&,void>> aCopy( rWindowImpl.maChildEventListeners );
             // we use an iterating counter/flag and a set of deleted Link's to avoid O(n^2) behaviour
-            rWindowImpl.maChildEventListenersIteratingCount++;
+            rWindowImpl.mnChildEventListenersIteratingCount++;
             comphelper::ScopeGuard aGuard(
                 [&rWindowImpl]()
                 {
-                    if (--rWindowImpl.maChildEventListenersIteratingCount == 0)
+                    if (--rWindowImpl.mnChildEventListenersIteratingCount == 0)
                     rWindowImpl.maChildEventListenersDeleted.clear();
                 }
             );
@@ -302,7 +302,7 @@ void Window::RemoveChildEventListener( const Link<VclWindowEvent&,void>& rEventL
     {
         auto& rListeners = mpWindowImpl->maChildEventListeners;
         rListeners.erase( std::remove(rListeners.begin(), rListeners.end(), rEventListener ), rListeners.end() );
-        if (mpWindowImpl->maChildEventListenersIteratingCount)
+        if (mpWindowImpl->mnChildEventListenersIteratingCount)
             mpWindowImpl->maChildEventListenersDeleted.insert(rEventListener);
     }
 }

vcl/source/window/window.cxx

@@ -631,6 +631,7 @@ WindowImpl::WindowImpl( WindowType nType )
     mpNextOverlap                       = nullptr;                      // next overlap window of frame
     mpLastFocusWindow                   = nullptr;                      // window for focus restore
     mpDlgCtrlDownWindow                 = nullptr;                      // window for dialog control
+    mnChildEventListenersIteratingCount = 0;
     mpFirstDel                          = nullptr;                      // Dtor notification list
     mpUserData                          = nullptr;                      // user data
     mpCursor                            = nullptr;                      // cursor