net: hns3: use kcalloc() instead of kzalloc()

net: hns3: use kcalloc() instead of kzalloc()

As noted in the kernel documentation, open-coded multiplication in
allocator arguments is discouraged because it can lead to integer overflow.

Use devm_kcalloc() to gain built-in overflow protection, making memory
allocation safer when calculating allocation size compared to explicit
multiplication.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Reviewed-by: Jijie Shao <shaojijie@huawei.com>
Link: https://patch.msgid.link/20250825142753.534509-1-rongqianfeng@vivo.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>