Author: Wu Fengguang <fengguang.wu@intel.com> net/ipv6/route.c:2946:3-8: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values. NULL check before some freeing functions is not needed. Based on checkpatch warning « kfree(NULL) is safe this check is probably not required » and kfreeaddr.cocci by …