Fix an out-of-boundary issue for wide string

core/src/fxge/win32/fx_win32_device.cpp

Index: core/src/fxge/win32/fx_win32_device.cpp
diff --git a/core/src/fxge/win32/fx_win32_device.cpp b/core/src/fxge/win32/fx_win32_device.cpp
index 2e2ea9a92b32635d53e24a3d94f1659f1882dabf..9c03a30837e569a3882c60c5ca2e673472f61459 100644
--- a/core/src/fxge/win32/fx_win32_device.cpp
+++ b/core/src/fxge/win32/fx_win32_device.cpp
@@ -328,7 +328,9 @@ void* CWin32FontInfo::MapFont(int weight, FX_BOOL bItalic, int charset, int pitc
     for (int i = 0; i < iCount; ++i) {
         if (face == VariantNames[i].m_pFaceName) {
             CFX_WideString wsFace = CFX_WideString::FromLocal(facebuf);
-            CFX_WideString wsName = CFX_WideString::FromUTF16LE((const unsigned short*)VariantNames[i].m_pVariantName);
+            const unsigned short* pName = (const unsigned short*)VariantNames[i].m_pVariantName;
+            FX_STRSIZE len = CFX_WideString::WStringLength(pName);
+            CFX_WideString wsName = CFX_WideString::FromUTF16LE(pName, len);
             if (wsFace == wsName) {
                 return hFont;
             }