C++11: Use nullptr. No functional change.

src/V3ProtectLib.cpp

@@ -486,31 +486,31 @@ private:
 
 public:
     explicit ProtectVisitor(AstNode* nodep)
-        : m_vfilep(NULL)
-        , m_cfilep(NULL)
-        , m_modPortsp(NULL)
-        , m_comboPortsp(NULL)
-        , m_seqPortsp(NULL)
-        , m_comboIgnorePortsp(NULL)
-        , m_comboDeclsp(NULL)
-        , m_seqDeclsp(NULL)
-        , m_tmpDeclsp(NULL)
-        , m_hashValuep(NULL)
-        , m_comboParamsp(NULL)
-        , m_clkSensp(NULL)
-        , m_comboIgnoreParamsp(NULL)
-        , m_seqParamsp(NULL)
-        , m_nbAssignsp(NULL)
-        , m_seqAssignsp(NULL)
-        , m_comboAssignsp(NULL)
-        , m_cHashValuep(NULL)
-        , m_cComboParamsp(NULL)
-        , m_cComboInsp(NULL)
-        , m_cComboOutsp(NULL)
-        , m_cSeqParamsp(NULL)
-        , m_cSeqClksp(NULL)
-        , m_cSeqOutsp(NULL)
-        , m_cIgnoreParamsp(NULL)
+        : m_vfilep(nullptr)
+        , m_cfilep(nullptr)
+        , m_modPortsp(nullptr)
+        , m_comboPortsp(nullptr)
+        , m_seqPortsp(nullptr)
+        , m_comboIgnorePortsp(nullptr)
+        , m_comboDeclsp(nullptr)
+        , m_seqDeclsp(nullptr)
+        , m_tmpDeclsp(nullptr)
+        , m_hashValuep(nullptr)
+        , m_comboParamsp(nullptr)
+        , m_clkSensp(nullptr)
+        , m_comboIgnoreParamsp(nullptr)
+        , m_seqParamsp(nullptr)
+        , m_nbAssignsp(nullptr)
+        , m_seqAssignsp(nullptr)
+        , m_comboAssignsp(nullptr)
+        , m_cHashValuep(nullptr)
+        , m_cComboParamsp(nullptr)
+        , m_cComboInsp(nullptr)
+        , m_cComboOutsp(nullptr)
+        , m_cSeqParamsp(nullptr)
+        , m_cSeqClksp(nullptr)
+        , m_cSeqOutsp(nullptr)
+        , m_cIgnoreParamsp(nullptr)
         , m_libName(v3Global.opt.protectLib())
         , m_topName(v3Global.opt.prefix())
         , m_foundTop(false)