[df] Inline HistoUtils::SetCanExtendAllAxes

It is only used in one place where we know it is a TH1D.

Author: hahnjo

tree/dataframe/inc/ROOT/RDF/InterfaceUtils.hxx

@@ -108,7 +108,6 @@ struct Book{};
 
 template <typename T, bool ISV6HISTO = std::is_base_of<TH1, std::decay_t<T>>::value>
 struct HistoUtils {
-   static void SetCanExtendAllAxes(T &h) { h.SetCanExtend(::TH1::kAllAxes); }
    static bool HasAxisLimits(T &h)
    {
       auto xaxis = h.GetXaxis();
@@ -118,7 +117,6 @@ struct HistoUtils {
 
 template <typename T>
 struct HistoUtils<T, false> {
-   static void SetCanExtendAllAxes(T &) {}
    static bool HasAxisLimits(T &) { return true; }
 };
 

tree/dataframe/inc/ROOT/RDF/RInterface.hxx

@@ -1942,7 +1942,7 @@ public:
       }
 
       if (h->GetXaxis()->GetXmax() == h->GetXaxis()->GetXmin())
-         RDFInternal::HistoUtils<::TH1D>::SetCanExtendAllAxes(*h);
+         h->SetCanExtend(::TH1::kAllAxes);
       return CreateAction<RDFInternal::ActionTags::Histo1D, V>(validatedColumns, h, h, fProxiedPtr);
    }