scsi: hisi_sas: Remove redundant checks for automatic debugfs dump

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


CVE: NA

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In commit 63f0733d07ce ("scsi: hisi_sas: Allocate DFX memory during dump
trigger"), the memory allocation time of the DFX is changed from device
initialization to dump occurs, so .debugfs_itct is not a valid address and
do not need to check.

The parameter hisi_sas_debugfs_enable is enough to check whether automatic
debugfs dump is triggered, so remove redunant checks.

Fixes: 63f0733d07ce ("scsi: hisi_sas: Allocate DFX memory during dump trigger")
Signed-off-by: Yihang Li <liyihang9@huawei.com>
Signed-off-by: xiabing <xiabing12@h-partners.com>