Better fix for snprintf non-termination on windows.

core/src/fxcrt/fx_basic_wstring.cpp

Index: core/src/fxcrt/fx_basic_wstring.cpp
diff --git a/core/src/fxcrt/fx_basic_wstring.cpp b/core/src/fxcrt/fx_basic_wstring.cpp
index ce6a1cd763e4add87739782a723bfeb140112a7b..dfdbef8bd61ceb5e6293aa2ef06d95e3b0c03313 100644
--- a/core/src/fxcrt/fx_basic_wstring.cpp
+++ b/core/src/fxcrt/fx_basic_wstring.cpp
@@ -976,9 +976,9 @@ void CFX_WideString::FormatV(FX_LPCWSTR lpszFormat, va_list argList)
                         nItemLen = nPrecision + nWidth + 128;
                     } else {
                         double f;
-                        char pszTemp[256] = {0};
+                        char pszTemp[256];
                         f = va_arg(argList, double);
-                        FXSYS_snprintf(pszTemp, sizeof(pszTemp) - 1, "%*.*f", nWidth, nPrecision + 6, f );
+                        FXSYS_snprintf(pszTemp, sizeof(pszTemp), "%*.*f", nWidth, nPrecision + 6, f );
                         nItemLen = (FX_STRSIZE)FXSYS_strlen(pszTemp);
                     }
                     break;