remove unnecessary Clear() and wrong delete

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77861 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/clipbrd.cpp

@@ -498,9 +498,6 @@ bool wxClipboard::AddData( wxDataObject *data )
 
     wxCHECK_MSG( data, false, wxT("data is invalid") );
 
-    /* we can only store one wxDataObject */
-    Clear();
-
     // in x11, the "copied data" hold by the program itself.
     // so here just use m_data to hold the "copied data"
     // use wxApp->ProcessXEvent to check whether there has
@@ -525,8 +522,6 @@ bool wxClipboard::AddData( wxDataObject *data )
     XChangeProperty(xdisplay, window, XA_CLIPBOARD, XA_STRING, 8, PropModeReplace,
                     buf.data(), size);
 
-    delete buf;
-
     XSetSelectionOwner(xdisplay, XA_CLIPBOARD, window, CurrentTime);
     XFlush(xdisplay);
     return true;