refix if-else logic for inference: missing if (#33531)

paddle/fluid/inference/api/analysis_predictor.cc

@@ -303,8 +303,10 @@ static void DisablePrepareDataOpt(
                             disable_opt || pre_disable_opt);
     }
     // disable prepare data if unfriendly op is found
+    if (!disable_opt) {
       disable_opt = IsPrepareDataOptTargetOp(op);
     }
+  }
 }
 
 bool AnalysisPredictor::PrepareExecutor() {