Make conversion to CPDF_Dest explicit

core/src/fpdfdoc/doc_action.cpp

Index: core/src/fpdfdoc/doc_action.cpp
diff --git a/core/src/fpdfdoc/doc_action.cpp b/core/src/fpdfdoc/doc_action.cpp
index 324153563a19d4f6d22cd4610fa3e502b36a45de..ac40335a4ca10311e0fd907a48df9bdb4b9ab879 100644
--- a/core/src/fpdfdoc/doc_action.cpp
+++ b/core/src/fpdfdoc/doc_action.cpp
@@ -7,25 +7,26 @@
 #include "../../include/fpdfdoc/fpdf_doc.h"
 CPDF_Dest CPDF_Action::GetDest(CPDF_Document* pDoc) const
 {
-    if (m_pDict == NULL) {
-        return NULL;
+    if (!m_pDict) {
+        return CPDF_Dest();
     }
     CFX_ByteString type = m_pDict->GetString("S");
     if (type != "GoTo" && type != "GoToR") {
-        return NULL;
+        return CPDF_Dest();
     }
     CPDF_Object* pDest = m_pDict->GetElementValue("D");
-    if (pDest == NULL) {
-        return NULL;
+    if (!pDest) {
+        return CPDF_Dest();
     }
     if (pDest->GetType() == PDFOBJ_STRING || pDest->GetType() == PDFOBJ_NAME) {
         CPDF_NameTree name_tree(pDoc, FX_BSTRC("Dests"));
         CFX_ByteStringC name = pDest->GetString();
-        return name_tree.LookupNamedDest(pDoc, name);
-    } else if (pDest->GetType() == PDFOBJ_ARRAY) {
-        return (CPDF_Array*)pDest;
+        return CPDF_Dest(name_tree.LookupNamedDest(pDoc, name));
     }
-    return NULL;
+    if (pDest->GetType() == PDFOBJ_ARRAY) {
+        return CPDF_Dest((CPDF_Array*)pDest);
+    }
+    return CPDF_Dest();
 }
 const FX_CHAR* g_sATypes[] = {"Unknown", "GoTo", "GoToR", "GoToE", "Launch", "Thread", "URI", "Sound", "Movie",
                               "Hide",	"Named", "SubmitForm", "ResetForm", "ImportData", "JavaScript", "SetOCGState",