Fix a bunch of sign mismatch warnings.

core/src/fxcodec/jbig2/JBig2_HuffmanTable.h

Index: core/src/fxcodec/jbig2/JBig2_HuffmanTable.h
diff --git a/core/src/fxcodec/jbig2/JBig2_HuffmanTable.h b/core/src/fxcodec/jbig2/JBig2_HuffmanTable.h
index 7c843cf91bd64d2173c9bf0a3e0456cf959d8ce0..fe8294dc7eee029ffe4f9a660d7dd217a9476c37 100644
--- a/core/src/fxcodec/jbig2/JBig2_HuffmanTable.h
+++ b/core/src/fxcodec/jbig2/JBig2_HuffmanTable.h
@@ -14,7 +14,7 @@ class CJBig2_HuffmanTable {
  public:
   CJBig2_HuffmanTable(const JBig2TableLine* pTable, int nLines, FX_BOOL bHTOOB);
 
-  CJBig2_HuffmanTable(CJBig2_BitStream* pStream);
+  explicit CJBig2_HuffmanTable(CJBig2_BitStream* pStream);
 
   ~CJBig2_HuffmanTable();
 
@@ -24,13 +24,13 @@ class CJBig2_HuffmanTable {
 
   int parseFromCodedBuffer(CJBig2_BitStream* pStream);
 
-  FX_BOOL isOK() { return m_bOK; }
+  FX_BOOL isOK() const { return m_bOK; }
 
  private:
   void init();
 
   FX_BOOL HTOOB;
-  int NTEMP;
+  FX_DWORD NTEMP;
   int* CODES;
   int* PREFLEN;
   int* RANGELEN;