ofz#32796: no pdfium during wmf fuzzing

Change-Id: I418615dd68618bb8623a052cf52a85b917d4382d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113492
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/source/filter/ipdf/pdfread.cxx b/vcl/source/filter/ipdf/pdfread.cxx
index 86adec4..9cdb100 100644
--- a/vcl/source/filter/ipdf/pdfread.cxx
+++ b/vcl/source/filter/ipdf/pdfread.cxx
@@ -66,6 +66,8 @@ bool getCompatibleStream(SvStream& rInStream, SvStream& rOutStream)
    {
        // Downconvert to PDF-1.6.
        auto pPdfium = vcl::pdf::PDFiumLibrary::get();
        if (!pPdfium)
            return false;

        // Read input into a buffer.
        SvMemoryStream aInBuffer;