mtd: rawnand: sunxi: Annotate struct sunxi_nand_chip 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 sunxi_nand_chip.

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

Cc: Miquel Raynal <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Vignesh Raghavendra <[email protected]>
Cc: Chen-Yu Tsai <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Cc: Samuel Holland <[email protected]>
Cc: Manuel Dipolt <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

Author: kees

drivers/mtd/nand/raw/sunxi_nand.c

@@ -197,7 +197,7 @@ struct sunxi_nand_chip {
 	u32 timing_cfg;
 	u32 timing_ctl;
 	int nsels;
-	struct sunxi_nand_chip_sel sels[];
+	struct sunxi_nand_chip_sel sels[] __counted_by(nsels);
 };
 
 static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand)