Get rid of NULLs in core/

core/fxge/win32/fx_win32_print.cpp

Index: core/fxge/win32/fx_win32_print.cpp
diff --git a/core/fxge/win32/fx_win32_print.cpp b/core/fxge/win32/fx_win32_print.cpp
index e46beeefbd6434736211e0d3ee7b7e1c4e4143e3..9a582efd272fb93f06abdad8914696edd8f2c9d7 100644
--- a/core/fxge/win32/fx_win32_print.cpp
+++ b/core/fxge/win32/fx_win32_print.cpp
@@ -278,7 +278,7 @@ FX_BOOL CGdiPrinterDriver::StartDIBits(const CFX_DIBSource* pSource,
 
 CPSOutput::CPSOutput(HDC hDC) {
   m_hDC = hDC;
-  m_pBuf = NULL;
+  m_pBuf = nullptr;
 }
 CPSOutput::~CPSOutput() {
   FX_Free(m_pBuf);
@@ -295,13 +295,13 @@ void CPSOutput::OutputPS(const FX_CHAR* str, int len) {
     int send_len = len > 1024 ? 1024 : len;
     *(uint16_t*)m_pBuf = send_len;
     FXSYS_memcpy(m_pBuf + 2, str + sent_len, send_len);
-    ExtEscape(m_hDC, PASSTHROUGH, send_len + 2, m_pBuf, 0, NULL);
+    ExtEscape(m_hDC, PASSTHROUGH, send_len + 2, m_pBuf, 0, nullptr);
     sent_len += send_len;
     len -= send_len;
   }
 }
 CPSPrinterDriver::CPSPrinterDriver() {
-  m_pPSOutput = NULL;
+  m_pPSOutput = nullptr;
   m_bCmykOutput = FALSE;
 }
 CPSPrinterDriver::~CPSPrinterDriver() {
@@ -322,7 +322,7 @@ FX_BOOL CPSPrinterDriver::Init(HDC hDC, int pslevel, FX_BOOL bCmykOutput) {
   HRGN hRgn = ::CreateRectRgn(0, 0, 1, 1);
   int ret = ::GetClipRgn(hDC, hRgn);
   if (ret == 1) {
-    ret = ::GetRegionData(hRgn, 0, NULL);
+    ret = ::GetRegionData(hRgn, 0, nullptr);
     if (ret) {
       RGNDATA* pData = (RGNDATA*)FX_Alloc(uint8_t, ret);
       ret = ::GetRegionData(hRgn, ret, pData);
@@ -334,7 +334,7 @@ FX_BOOL CPSPrinterDriver::Init(HDC hDC, int pslevel, FX_BOOL bCmykOutput) {
           path.AppendRect((FX_FLOAT)pRect->left, (FX_FLOAT)pRect->bottom,
                           (FX_FLOAT)pRect->right, (FX_FLOAT)pRect->top);
         }
-        m_PSRenderer.SetClip_PathFill(&path, NULL, FXFILL_WINDING);
+        m_PSRenderer.SetClip_PathFill(&path, nullptr, FXFILL_WINDING);
       }
       FX_Free(pData);
     }
@@ -455,7 +455,7 @@ FX_BOOL CPSPrinterDriver::StartDIBits(const CFX_DIBSource* pBitmap,
   if (bitmap_alpha < 255) {
     return FALSE;
   }
-  handle = NULL;
+  handle = nullptr;
   return m_PSRenderer.DrawDIBits(pBitmap, color, pMatrix, render_flags,
                                  alpha_flag, pIccTransform);
 }