net: hns3: add netdev reset check for hns3_set_tunable()

mainline inclusion
from mainline-net-5.17
commit f5cd6016
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4YXIM
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f5cd60169f98



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When pci device reset failed, it does uninit operation and priv->ring
is NULL, it causes accessing NULL pointer error.

Add netdev reset check for hns3_set_tunable() to fix it.

Fixes: 99f6b5fb ("net: hns3: use bounce buffer when rx page can not be reused")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>