net: hns3: fix spelling mistake "reg_um" -> "reg_num"

There are spelling mistakes in hclgevf_get_regs. Fix them.

Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250623040043.857782-2-shaojijie@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>