Fix formatting (#216)

Signed-off-by: Antonio Paolillo <[email protected]>

Author: apaolillo

benchkit/utils/system.py

@@ -22,9 +22,11 @@ def _get_windows_boot_args() -> str:
 def _get_netbsd_boot_args() -> str:
     return "<boot args fetching is unsupported on NetBSD>"
 
+
 def _get_darwin_boot_args() -> str:
     return "<boot args fetching is unsupported on Darwin>"
 
+
 def get_boot_args() -> str:
     """
     Return the boot arguments used on the currently running kernel.