net: hisilicon: Annotate struct rcb_common_cb with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct rcb_common_cb.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Yisen Zhuang <yisen.zhuang@huawei.com>
Cc: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922172858.3822653-6-keescook@chromium.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.h

@@ -108,7 +108,7 @@ struct rcb_common_cb {
 	u32 ring_num;
 	u32 desc_num; /*  desc num per queue*/
 
-	struct ring_pair_cb ring_pair_cb[];
+	struct ring_pair_cb ring_pair_cb[] __counted_by(ring_num);
 };
 
 int hns_rcb_buf_size2type(u32 buf_size);