[http] small sniffer optimization

use nullptr, reduce includes, remove unnecessary initializer

net/http/inc/TRootSniffer.h

@@ -43,8 +43,8 @@ protected:
    UInt_t fMask{0};                       ///<! defines operation kind
    const char *fSearchPath{nullptr};      ///<! current path searched
    Int_t fLevel{0};                       ///<! current level of hierarchy
-   TString fItemName{};                   ///<! name of current item
-   TList fItemsNames{};                   ///<! list of created items names, need to avoid duplication
+   TString fItemName;                     ///<! name of current item
+   TList fItemsNames;                     ///<! list of created items names, need to avoid duplication
    Int_t fRestriction{0};                 ///<! restriction 0 - default, 1 - read-only, 2 - full access
 
    TRootSnifferStore *fStore{nullptr}; ///<! object to store results

net/http/src/TRootSniffer.cxx

@@ -760,7 +760,7 @@ void TRootSniffer::ScanObjectChilds(TRootSnifferScanRec &rec, TObject *obj)
       ScanCollection(rec, ((TFolder *)obj)->GetListOfFolders());
    } else if (obj->InheritsFrom(TDirectory::Class())) {
       TDirectory *dir = (TDirectory *)obj;
-      ScanCollection(rec, dir->GetList(), 0, dir->GetListOfKeys());
+      ScanCollection(rec, dir->GetList(), nullptr, dir->GetListOfKeys());
    }
    if (rec.CanExpandItem()) {
       ScanObjectMembers(rec, obj->IsA(), (char *)obj);
@@ -1846,7 +1846,7 @@ Bool_t TRootSniffer::RegisterCommand(const char *cmdname, const char *method, co
    Int_t numargs = 0;
    do {
       TString nextname = TString::Format("%sarg%d%s", "%", numargs + 1, "%");
-      if (strstr(method, nextname.Data()) == 0)
+      if (strstr(method, nextname.Data()) == nullptr)
          break;
       numargs++;
    } while (numargs < 100);

net/httpsniff/src/TRootSnifferFull.cxx

@@ -41,7 +41,6 @@
 #include "THttpCallArg.h"
 
 #include <stdlib.h>
-#include <vector>
 #include <string.h>
 
 //////////////////////////////////////////////////////////////////////////