Remove unnecessary code

BUG=pdfium:421
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1758643002 .
diff --git a/fpdfsdk/src/fsdk_annothandler.cpp b/fpdfsdk/src/fsdk_annothandler.cpp
index 27e5e23..5c77b39 100644
--- a/fpdfsdk/src/fsdk_annothandler.cpp
+++ b/fpdfsdk/src/fsdk_annothandler.cpp
@@ -85,8 +85,6 @@
 #endif  // PDF_ENABLE_XFA
 
 void CPDFSDK_AnnotHandlerMgr::ReleaseAnnot(CPDFSDK_Annot* pAnnot) {
-  pAnnot->GetPDFPage();
-
   if (IPDFSDK_AnnotHandler* pAnnotHandler = GetAnnotHandler(pAnnot)) {
     pAnnotHandler->OnRelease(pAnnot);
     pAnnotHandler->ReleaseAnnot(pAnnot);