change error raise to klipper style

scanner.py

@@ -1721,7 +1721,7 @@ def _is_faulty_coordinate(self, x, y, add_offsets=False):
     def _check_hardware(self, sample):
         # Validate sample input
         if "data" not in sample or "freq" not in sample:
-            raise ValueError("Sample must contain 'data' and 'freq' keys.")
+            raise error("Sample must contain 'data' and 'freq' keys.")
 
         # Initialize variables on the first call
         if not hasattr(self, "freq_window"):
@@ -3308,7 +3308,7 @@ def _generate_path(self):
             pa = (begin_a, pos_p) if even else (end_a, pos_p)
             pb = (end_a, pos_p) if even else (begin_a, pos_p)
 
-            l = (pa, pb)
+            line_segment = (pa, pb)
 
             if len(points) > 0 and corner_radius > 0:
                 # We need to insert an overscan corner. Basically we insert
@@ -3340,8 +3340,8 @@ def _generate_path(self):
                         center, pos_p - corner_radius, corner_radius, 0, 90
                     )
 
-            points.append(l[0])
-            points.append(l[1])
+            points.append(line_segment[0])
+            points.append(line_segment[1])
 
         if swap_coord:
             for i in range(len(points)):