Update yolo.py

[glenn-jocher]

Cleanup from #7060

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Refinement in anchor order checking within YOLOv5 model initialization.

📊 Key Changes

• Reordered the sequence of operations in the model initialization to perform the anchor order check before calculating the network stride.

🎯 Purpose & Impact

• 🎯 Purpose: This change ensures that anchor order verification is done earlier in the setup process, improving error detection in network configurations.
• 🚀 Impact: Users can expect more reliable model initialization, leading to potentially better object detection performance and stability. This small update contributes to the overall robustness of the YOLOv5 initialization process.

[glenn-jocher]

m.stride is undefined here causing error. Closing PR.