Use wxDELETE() and wxDELETEA() when possible.

Use wxDELETE[A]() functions which automatically NULL out their arguments after
deleting them instead of doing it manually.

Closes #9685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/fs_arc.cpp

@@ -135,10 +135,8 @@ wxArchiveFSEntry *wxArchiveFSCacheDataImpl::AddToCache(wxArchiveEntry *entry)
 
 void wxArchiveFSCacheDataImpl::CloseStreams()
 {
-    delete m_archive;
-    m_archive = NULL;
-    delete m_stream;
-    m_stream = NULL;
+    wxDELETE(m_archive);
+    wxDELETE(m_stream);
 }
 
 wxArchiveEntry *wxArchiveFSCacheDataImpl::Get(const wxString& name)