[roottest] use std::fabs in fascloningeventtree tests

Author: linev

roottest/root/tree/fastcloningeventtree/dt_RunDrawTest.C

@@ -9,6 +9,7 @@
 #include "TBranchElement.h"
 
 #include <iostream>
+#include <cmath>
 
 #include "dt_DrawTest.C"
 
@@ -40,9 +41,9 @@ Int_t HistCompare(TH1 *ref, TH1 *comp)
 
    Float_t xrange = ref->GetXaxis()->GetXmax() - ref->GetXaxis()->GetXmin();
    if (xrange==0) { fprintf(stderr,"no range for %s\n",ref->GetName()); return -4; }
-   if (xrange>0.0001 && TMath::Abs((mean1-mean2)/xrange) > 0.001)  return -1;
-   if (mean2> 0.0001 && TMath::Abs((mean1-mean2)/mean2) > 0.01)    return -2;
-   if (rms1 > 0.0001 && TMath::Abs((rms1-rms2)/rms1) > 0.0001)     return -3;
+   if (xrange>0.0001 && std::fabs((mean1-mean2)/xrange) > 0.001)  return -1;
+   if (mean2> 0.0001 && std::fabs((mean1-mean2)/mean2) > 0.01)    return -2;
+   if (rms1 > 0.0001 && std::fabs((rms1-rms2)/rms1) > 0.0001)     return -3;
    return n1*factor-n2;
 }