Since netif_napi_del() is already done in the free_candev(), we remove
this redundant netif_napi_del() invocation. In addition, this patch
can match the operations in the xcan_probe() and xcan_remove()
functions.

Link: https://lore.kernel.org/all/20211017125022.3100329-1-mudongliangabcd@gmail.comSigned-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>