Fix compiler warning on rd_kafka_TopicPartitionInfo_partition#5151
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dzbarsky wants to merge 2 commits intoconfluentinc:masterfrom 
Open
Fix compiler warning on rd_kafka_TopicPartitionInfo_partition#5151dzbarsky wants to merge 2 commits intoconfluentinc:masterfrom 
dzbarsky wants to merge 2 commits intoconfluentinc:masterfrom