Add error forwarding to loadCEntropy(), make check for dictSize >= 8 from bad merge

lib/compress/zstd_compress_internal.h

@@ -930,6 +930,7 @@ MEM_STATIC void ZSTD_debugTable(const U32* table, U32 max)
 #if defined (__cplusplus)
 }
 #endif
+
 /* ===============================================================
  * Shared internal declarations
  * These prototypes may be called from sources not in lib/compress
@@ -937,7 +938,9 @@ MEM_STATIC void ZSTD_debugTable(const U32* table, U32 max)
 
 /* ZSTD_loadCEntropy() :
  * dict : must point at beginning of a valid zstd dictionary.
- * return : size of dictionary header (size of magic number + dict ID + entropy tables) */
+ * return : size of dictionary header (size of magic number + dict ID + entropy tables)
+ * assumptions : magic number supposed already checked
+ *               and dictSize >= 8 */
 size_t ZSTD_loadCEntropy(ZSTD_compressedBlockState_t* bs, void* workspace,
                          short* offcodeNCount, unsigned* offcodeMaxValue,
                          const void* const dict, size_t dictSize);