Detect resursive loading of type3 font char to avoid infinite loop

core/fpdfapi/fpdf_font/cpdf_cidfont.cpp

Index: core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
diff --git a/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp b/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
index ce7d5090d54bb41bbdd57631a9ffac11bbbe37cc..45db54fa67fa2c361b84eea08a44ed1207afdfdb 100644
--- a/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
+++ b/core/fpdfapi/fpdf_font/cpdf_cidfont.cpp
@@ -428,7 +428,7 @@ bool CPDF_CIDFont::Load() {
   return true;
 }
 
-FX_RECT CPDF_CIDFont::GetCharBBox(uint32_t charcode, int level) {
+FX_RECT CPDF_CIDFont::GetCharBBox(uint32_t charcode) {
   if (charcode < 256 && m_CharBBox[charcode].right != -1)
     return m_CharBBox[charcode];
 
@@ -499,7 +499,7 @@ FX_RECT CPDF_CIDFont::GetCharBBox(uint32_t charcode, int level) {
   return rect;
 }
 
-int CPDF_CIDFont::GetCharWidthF(uint32_t charcode, int level) {
+int CPDF_CIDFont::GetCharWidthF(uint32_t charcode) {
   if (charcode < 0x80 && m_bAnsiWidthsFixed)
     return (charcode >= 32 && charcode < 127) ? 500 : 0;