Update CloseDocument and ExitForm
diff --git a/samples/pdfium_test.cc b/samples/pdfium_test.cc
index a9904ab..c5ac75e 100644
--- a/samples/pdfium_test.cc
+++ b/samples/pdfium_test.cc
@@ -356,8 +356,8 @@
   }
 
   FORM_DoDocumentAAction(form, FPDFDOC_AACTION_WC);
-  FPDFDOC_ExitFormFillEnviroument(form);
   FPDF_CloseDocument(doc);
+  FPDFDOC_ExitFormFillEnviroument(form);
   FPDFAvail_Destroy(pdf_avail);
 
   printf("Loaded, parsed and rendered %zu pages.\n", rendered_pages);