netdevsim: switch to memdup_user_nul()

[ Upstream commit 20fd4f42 ]

Use memdup_user_nul() helper instead of open-coding to
simplify the code.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: ee767463 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()")
Signed-off-by: Sasha Levin <sashal@kernel.org>