Make sure chunk size is sufficient (#338)

python/kiss_icp/datasets/helipr.py

@@ -130,7 +130,7 @@ def get_data(self, idx: int):
         with open(file_path, "rb") as f:
             binary = f.read()
             offset = 0
-            while offset < len(binary):
+            while offset < len(binary) - chunk_size:
                 list_lines.append(struct.unpack_from(f"={format_string}", binary, offset))
                 offset += chunk_size
         data = np.stack(list_lines)