Add a proper bounds check to XFA_FM_KeywordToString

xfa/src/fxfa/src/fm2js/xfa_lexer.h

Index: xfa/src/fxfa/src/fm2js/xfa_lexer.h
diff --git a/xfa/src/fxfa/src/fm2js/xfa_lexer.h b/xfa/src/fxfa/src/fm2js/xfa_lexer.h
index 5db3b093cd8ac1f881c7575229fcad663cc1d46a..ccfa9f546e6b758d5ddf02b8de915afd914e9e89 100644
--- a/xfa/src/fxfa/src/fm2js/xfa_lexer.h
+++ b/xfa/src/fxfa/src/fm2js/xfa_lexer.h
@@ -83,7 +83,7 @@ enum XFA_FM_TOKEN {
 struct XFA_FMKeyword {
   XFA_FM_TOKEN m_type;
   uint32_t m_uHash;
-  const FX_WCHAR* m_keword;
+  const FX_WCHAR* m_keyword;
 };
 
 const FX_WCHAR* XFA_FM_KeywordToString(XFA_FM_TOKEN op);