small fix

Author: Luzhiyongg

PWGCF/Flow/Tasks/flowTask.cxx

@@ -1286,7 +1286,7 @@ struct FlowTask {
     if (count_Gap08 > 0)
       registry.fill(HIST("hMeanPtWithinGap08_MC"), independent, ptSum_Gap08 / count_Gap08, 1.0);
     int sampleIndex = static_cast<int>(cfgNbootstrap * lRandom);
-    if (count_Gap08)
+    if (count_Gap08 > 0)
       bootstrapArray[sampleIndex][kMeanPtWithinGap08_MC]->Fill(independent, ptSum_Gap08 / count_Gap08, 1.0);
 
     // Filling Flow Container