net: hns3: correct the logic of hclge_sync_vf_qb_mode()

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7YRUW


CVE: NA

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Now, hns3 driver set request_enable to qb_en whether hclge_set_fd_qb()
returns failure, it's incorrect.

We only set request_enable to qb_en when hclge_set_fd_qb() returns 0.
so, change it.

Signed-off-by: Hao Chen <chenhao418@huawei.com>