[scripts] Fix misspelled variable in reverb script (kaldi-asr#3678)

egs/wsj/s5/steps/data/reverberate_data_dir.py

@@ -468,7 +468,7 @@ def smooth_probability_distribution(set_list, smoothing_weight=0.0, target_sum=1
       uniform_probability = 0
       if num_unspecified > 0 and accumulated_prob < 1:
           uniform_probability = (1 - accumulated_prob) / float(num_unspecified)
-      elif num_unspecified > 0 and accumulate_prob >= 1:
+      elif num_unspecified > 0 and accumulated_prob >= 1:
           warnings.warn("The sum of probabilities specified by user is larger than or equal to 1. "
                         "The items without probabilities specified will be given zero to their probabilities.")