net: hisilicon: fix hsn3_ethtool kernel-doc warnings

mainline inclusion
from mainline-master
commit 85879f13
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4I7P7
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=85879f131d78



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Fix kernel-doc warnings and spacing in hns3_ethtool.c:

hns3_ethtool.c:246: warning: No description found for return value of 'hns3_lp_run_test'
hns3_ethtool.c:408: warning: expecting prototype for hns3_nic_self_test(). Prototype was for hns3_self_test() instead

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Peng Li <lipeng321@huawei.com>
Cc: Guangbin Huang <huangguangbin2@huawei.com>
Cc: Yisen Zhuang <yisen.zhuang@huawei.com>
Cc: Salil Mehta <salil.mehta@huawei.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Yongxin Li <liyongxin1@huawei.com>
Signed-off-by: Junxin Chen <chenjunxin1@huawei.com>
(fix conflicts: remove hns3_do_selftest's fix due to a previous fix: 65b017dc "net: hns3: fix prototype warning")
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>