Fix code style in shift benchmark

cpp/benchmarks/copying/shift.cu

@@ -69,15 +69,15 @@ static void BM_shift(benchmark::State& state)
     auto output = cudf::shift(input, offset, *fill);
   }
 
-  auto const elems_read    = (size - offset);
-  auto const bytes_read    = elems_read * sizeof(int);
+  auto const elems_read = (size - offset);
+  auto const bytes_read = elems_read * sizeof(int);
 
   // If 'use_validity' is false, the fill value is a number, and the entire column
   // (excluding the null bitmask) needs to be written. On the other hand, if 'use_validity'
   // is true, only the elements that can be shifted are written, along with the full null bitmask.
   auto const elems_written = use_validity ? (size - offset) : size;
   auto const bytes_written = elems_written * sizeof(int);
-  auto const null_bytes = use_validity ? 2 * cudf::bitmask_allocation_size_bytes(size) : 0;
+  auto const null_bytes    = use_validity ? 2 * cudf::bitmask_allocation_size_bytes(size) : 0;
 
   state.SetBytesProcessed(static_cast<int64_t>(state.iterations()) *
                           (bytes_written + bytes_read + null_bytes));