Apply ruff==0.9.0 formatting (#18624)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

ultralytics/data/utils.py

@@ -60,8 +60,7 @@ def exif_size(img: Image.Image):
     s = img.size  # (width, height)
     if img.format == "JPEG":  # only support JPEG images
         try:
-            exif = img.getexif()
-            if exif:
+            if exif := img.getexif():
                 rotation = exif.get(274, None)  # the EXIF key for the orientation tag is 274
                 if rotation in {6, 8}:  # rotation 270 or 90
                     s = s[1], s[0]
@@ -125,8 +124,7 @@ def verify_image_label(args):
                     segments = [np.array(x[1:], dtype=np.float32).reshape(-1, 2) for x in lb]  # (cls, xy1...)
                     lb = np.concatenate((classes.reshape(-1, 1), segments2boxes(segments)), 1)  # (cls, xywh)
                 lb = np.array(lb, dtype=np.float32)
-            nl = len(lb)
-            if nl:
+            if nl := len(lb):
                 if keypoint:
                     assert lb.shape[1] == (5 + nkpt * ndim), f"labels require {(5 + nkpt * ndim)} columns each"
                     points = lb[:, 5:].reshape(-1, ndim)[:, :2]