Make most PDFium code pass Clang plugin's auto raw check.

Change-Id: I9dc32342e24361389841ecba83081a97fc043377
Reviewed-on: https://pdfium-review.googlesource.com/2959
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_interform.cpp b/fpdfsdk/cpdfsdk_interform.cpp
index 4ebcf8a..1dbffa4 100644
--- a/fpdfsdk/cpdfsdk_interform.cpp
+++ b/fpdfsdk/cpdfsdk_interform.cpp
@@ -321,7 +321,7 @@
 }
 
 void CPDFSDK_InterForm::UpdateField(CPDF_FormField* pFormField) {
-  auto formfiller = m_pFormFillEnv->GetInteractiveFormFiller();
+  auto* formfiller = m_pFormFillEnv->GetInteractiveFormFiller();
   for (int i = 0, sz = pFormField->CountControls(); i < sz; i++) {
     CPDF_FormControl* pFormCtrl = pFormField->GetControl(i);
     ASSERT(pFormCtrl);