sysfs: checking for NULL instead of ERR_PTR
d_path() returns an ERR_PTR and it doesn't return NULL. Signed-off-by: NDan Carpenter <error27@gmail.com> Cc: stable <stable@kernel.org> Reviewed-by: N"Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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