[dia] pdf-import: Use a unique_ptr for the created PDFDoc

[Zander Brown <zbrown src gnome org>]

commit e67d2a7605538bf60e551ad4ac3e57a277676a0a
Author: Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>
Date:   Sat Apr 9 10:07:29 2022 -0700

    pdf-import: Use a unique_ptr for the created PDFDoc

 plug-ins/pdf/pdf-import.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/plug-ins/pdf/pdf-import.cpp b/plug-ins/pdf/pdf-import.cpp
index d3977c33f..189737908 100644
--- a/plug-ins/pdf/pdf-import.cpp
+++ b/plug-ins/pdf/pdf-import.cpp
@@ -867,7 +867,7 @@ extern "C"
 gboolean
 import_pdf(const gchar *filename, DiagramData *dia, DiaContext *ctx, void* user_data)
 {
-  PDFDoc *doc;
+  std::unique_ptr<PDFDoc> doc;
   GooString *fileName = new GooString(filename);
   // no passwords yet
   GooString *ownerPW = NULL;
@@ -899,7 +899,6 @@ import_pdf(const gchar *filename, DiagramData *dia, DiaContext *ctx, void* user_
     delete diaOut;
     ret = TRUE;
   }
-  delete doc;
   delete fileName;
 
   return ret;