Reordering to match original code

Author: BrianMichell

src/mdio/segy/_workers.py

@@ -110,13 +110,14 @@ def trace_worker(  # noqa: PLR0913
         SummaryStatistics object containing statistics about the written traces.
     """
     global _worker_segy_file
-    # Setting the zarr config to 1 thread to ensure we honor the `MDIO__IMPORT__CPU_COUNT` environment variable.
-    # The Zarr 3 engine utilizes multiple threads. This can lead to resource contention and unpredictable memory usage.
-    zarr_config.set({"threading.max_workers": 1})
 
     # Use the pre-opened segy file from worker initialization
     segy_file = _worker_segy_file
 
+    # Setting the zarr config to 1 thread to ensure we honor the `MDIO__IMPORT__CPU_COUNT` environment variable.
+    # The Zarr 3 engine utilizes multiple threads. This can lead to resource contention and unpredictable memory usage.
+    zarr_config.set({"threading.max_workers": 1})
+
     region_slices = tuple(region.values())
     local_grid_map = grid_map[region_slices[:-1]]  # minus last (vertical) axis