wifi: ipw2x00: Annotate struct libipw_txb 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 libipw_txb.

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

Cc: Stanislav Yakovlev <stas.yakovlev@gmail.com>
Cc: Kalle Valo <kvalo@kernel.org>
Cc: linux-wireless@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230915200602.never.582-kees@kernel.org

drivers/net/wireless/intel/ipw2x00/libipw.h

@@ -488,7 +488,7 @@ struct libipw_txb {
 	u8 reserved;
 	u16 frag_size;
 	u16 payload_size;
-	struct sk_buff *fragments[];
+	struct sk_buff *fragments[] __counted_by(nr_frags);
 };
 
 /* SWEEP TABLE ENTRIES NUMBER */