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/unix/fswatcher_inotify.cpp

@@ -91,8 +91,7 @@ public:
         wxCHECK_RET( IsOk(),
                     "Inotify not initialized or invalid inotify descriptor" );
 
-        delete m_source;
-        m_source = NULL;
+        wxDELETE(m_source);
 
         if ( close(m_ifd) != 0 )
         {