Fixed processed bytes calculation in APPLY_BOOLEAN_MASK benchmark. (#…

…13937)

Due to missing parentheses in APPLY_BOOLEAN_MASK benchmark, the number of written bytes were not multiplied by the number of iterations of this benchmark.

This patch relates to #13735.

Authors:
  - Martin Marenz (https://github.com/Blonck)

Approvers:
  - Nghia Truong (https://github.com/ttnghia)
  - David Wendt (https://github.com/davidwendt)

URL: #13937

cpp/benchmarks/stream_compaction/apply_boolean_mask.cpp

@@ -65,7 +65,7 @@ void calculate_bandwidth(benchmark::State& state, cudf::size_type num_columns)
     (column_bytes_out + validity_bytes_out) * num_columns;  // writing columns
 
   state.SetItemsProcessed(state.iterations() * column_size * num_columns);
-  state.SetBytesProcessed(static_cast<int64_t>(state.iterations()) * bytes_read + bytes_written);
+  state.SetBytesProcessed(static_cast<int64_t>(state.iterations()) * (bytes_read + bytes_written));
 }
 
 }  // namespace