can: mcp251xfd: remove useless code in mcp251xfd_chip_softreset

can: mcp251xfd: remove useless code in mcp251xfd_chip_softreset

It would directly return if the variable err equals to 0 or other errors.
Only when the err equals to -ETIMEDOUT it can reach the 'if (err)'
statement, so the 'if (err)' and last 'return -ETIMEDOUT' statements are
useless. Romove them.

Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Link: https://lore.kernel.org/r/1605605352-25298-1-git-send-email-kaixuxia@tencent.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>