Watch destruction of widgets around OnAAction() method

fpdfsdk/formfiller/cffl_radiobutton.cpp

Index: fpdfsdk/formfiller/cffl_radiobutton.cpp
diff --git a/fpdfsdk/formfiller/cffl_radiobutton.cpp b/fpdfsdk/formfiller/cffl_radiobutton.cpp
index 17573fd625bc420715960423e9488ccfee36f9d5..aa035a13546ef1a7853040c99ef7849b21a7ecde 100644
--- a/fpdfsdk/formfiller/cffl_radiobutton.cpp
+++ b/fpdfsdk/formfiller/cffl_radiobutton.cpp
@@ -51,11 +51,12 @@ FX_BOOL CFFL_RadioButton::OnChar(CPDFSDK_Annot* pAnnot,
 
       FX_BOOL bReset = FALSE;
       FX_BOOL bExit = FALSE;
-      m_pEnv->GetInteractiveFormFiller()->OnButtonUp(m_pWidget, pPageView,
+      CPDFSDK_Annot::ObservedPtr pObserved(m_pWidget);
+      m_pEnv->GetInteractiveFormFiller()->OnButtonUp(pObserved, pPageView,
                                                      bReset, bExit, nFlags);
-      if (bReset)
-        return TRUE;
-      if (bExit)
+      if (!pObserved)
+        bExit = TRUE;
+      if (bReset || bExit)
         return TRUE;
 
       CFFL_FormFiller::OnChar(pAnnot, nChar, nFlags);