fail earlier on bad offsets

Change-Id: Ifea7653435743bb652afa68d734ed553b04606d7
Reviewed-on: https://gerrit.libreoffice.org/42804Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sfx2/source/doc/oleprops.cxx

@@ -1186,7 +1186,8 @@ void SfxOlePropertySet::ImplLoad( SvStream& rStrm )
             break;
         nSectPosPos = rStrm.Tell();
         // read section
-        rStrm.Seek(nSectPos);
+        if (!checkSeek(rStrm, nSectPos))
+            break;
         LoadObject(rStrm, AddSection(aSectGuid));
         if (!rStrm.good())
             break;