RDMA: Annotate struct rdma_hw_stats 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 rdma_hw_stats.

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

Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230929180431.3005464-1-keescook@chromium.orgSigned-off-by: Leon Romanovsky <leon@kernel.org>

include/rdma/ib_verbs.h

@@ -608,7 +608,7 @@ struct rdma_hw_stats {
 	const struct rdma_stat_desc *descs;
 	unsigned long	*is_disabled;
 	int		num_counters;
-	u64		value[];
+	u64		value[] __counted_by(num_counters);
 };
 
 #define RDMA_HW_STATS_DEFAULT_LIFESPAN 10