[respeaker_ros] Fixed bytes calculation 'self.n_channe - 2' -> '(self.n_channel - 2)'

Author: iory

respeaker_ros/scripts/respeaker_node.py

@@ -410,7 +410,7 @@ def __init__(self):
             self.pub_speech_audio_raw = rospy.Publisher(
                 "speech_audio_raw", AudioData, queue_size=10)
             self.speech_raw_prefetch_bytes = int(
-                self.n_channel - 2
+                (self.n_channel - 2)
                 * self.speech_prefetch
                 * self.respeaker_audio.rate
                 * self.respeaker_audio.bitdepth / 8.0)