scsi: hisi_sas: Check whether debugfs is enabled before removing or releasing it

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8IL6H


CVE: NA

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Hisi_sas debugfs remove should be executed only when debugfs is enabled.
In this patch, check whether debugfs is enabled and then remove it.

Signed-off-by: Yihang Li <liyihang9@huawei.com>
Signed-off-by: xiabing <xiabing12@h-partners.com>