Correct the way to count pages and to avoid infinite loop

fpdfsdk/src/fpdfview_embeddertest.cpp

Index: fpdfsdk/src/fpdfview_embeddertest.cpp
diff --git a/fpdfsdk/src/fpdfview_embeddertest.cpp b/fpdfsdk/src/fpdfview_embeddertest.cpp
index 3147c01660ee2102b877787aac5a1fe118b4cde8..670c640668c65edca6dcf944cc061d8fd96b38d2 100644
--- a/fpdfsdk/src/fpdfview_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfview_embeddertest.cpp
@@ -227,4 +227,9 @@ TEST_F(FPDFViewEmbeddertest, Hang_343) {
 // dictionary will not cause an infinite loop in CPDF_SyntaxParser::GetObject().
 TEST_F(FPDFViewEmbeddertest, Hang_344) {
   EXPECT_FALSE(OpenDocument("bug_344.pdf"));
+}
+
+// The test should pass even when the file has circular references to pages.
+TEST_F(FPDFViewEmbeddertest, Hang_360) {
+  EXPECT_FALSE(OpenDocument("bug_360.pdf"));
 }