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Remove dir in nsim_dev_debugfs_init() when creating ports dir failed.
Otherwise, the netdevsim device will not be created next time. Kernel
reports an error: debugfs: Directory 'netdevsim1' with parent 'netdevsim'
already present!
Fixes: ab1d0cc004 ("netdevsim: change debugfs tree topology")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>