fix a type in WfAnalyzer

include/WfAnalyzer.h

@@ -153,7 +153,7 @@ public:
 
         // calculate pedestal
         if (nped <= nsamples/4) {
-            data.ped = CalcPedestal(&buffer[0], nsamples, 1.5, 3);
+            data.ped = CalcPedestal(&ybuf[0], nsamples, 1.5, 3);
         } else {
             data.ped = CalcPedestal(&ybuf[0], nped, 1.2, 3);
         }