IB/srp: Annotate struct srp_fr_pool 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 srp_fr_pool.

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

Cc: Bart Van Assche <bvanassche@acm.org>
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/20230929180431.3005464-5-keescook@chromium.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: kees

drivers/infiniband/ulp/srp/ib_srp.h

@@ -306,7 +306,7 @@ struct srp_fr_pool {
 	int			max_page_list_len;
 	spinlock_t		lock;
 	struct list_head	free_list;
-	struct srp_fr_desc	desc[];
+	struct srp_fr_desc	desc[] __counted_by(size);
 };
 
 /**