dtmail: Further Coverity fixes

cde/programs/dtmail/MotifApp/MainWindow.C

@@ -110,6 +110,7 @@ MainWindow::MainWindow( char *name, Boolean allowResize ) : UIComponent ( name )
     _last_state = 0;
     _flash_owin = 0;
     _flash_iwin = 0;
+    _main = NULL;
     memset(&_window_attributes, 0, sizeof(XWindowAttributes));
 
     assert ( theApplication != NULL ); // Application object must exist

cde/programs/dtmail/MotifApp/MenuBar.C

@@ -260,7 +260,7 @@ MenuBar::createPulldown (
     }
 
     XtManageChildren ( head_wl, num_wl );
-    delete head_wl;
+    delete [] head_wl;
 
     return(pulldown);
 }