Add FPDF_FreeDefaultSystemFontInfo API

public/fpdf_sysfontinfo.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef PUBLIC_FPDF_SYSFONTINFO_H_
 #define PUBLIC_FPDF_SYSFONTINFO_H_
 
 #include "fpdfview.h"
@@ skipping 272 matching lines @@
  *          For some platforms Foxit SDK implement a default version of system
  *font info interface.
  *          The default implementation can be used in FPDF_SetSystemFontInfo
  *function.
  * Parameters:
  *          None
  * Return Value:
  *          Pointer to a FPDF_SYSFONTINFO structure describing the default
  *interface.
  *          Or NULL if the platform doesn't have a default interface.
- *          Application should call FPDF_FreeMemory to free the returned
- *pointer.
+ *          Application should call FPDF_FreeDefaultSystemFontInfo to free the
+ *returned pointer.
  **/
 DLLEXPORT FPDF_SYSFONTINFO* STDCALL FPDF_GetDefaultSystemFontInfo();
 
+/**
+ * Function: FPDF_FreeDefaultSystemFontInfo
+ *           Free a default system font info interface
+ * Comments:
+ *           This function should be called on the output from
+ *FPDF_SetSystemFontInfo once it is no longer needed by the client.
+ * Parameters:
+ *           pFontInfo       -   Pointer to a FPDF_SYSFONTINFO structure
+ * Return Value:
+ *          None
+ **/
+DLLEXPORT void FPDF_FreeDefaultSystemFontInfo(FPDF_SYSFONTINFO* pFontInfo);
+
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // PUBLIC_FPDF_SYSFONTINFO_H_