net: hns3: void array out of bound when loop tnl_num

In the Linux kernel, the following vulnerability has been resolved:

net: hns3: void array out of bound when loop tnl_num

When query reg inf of SSU, it loops tnl_num times. However, tnl_num comes

from hardware and the length of array is a fixed value. To void array out

of bound, make sure the loop time is not greater than the length of array