mtd: subpagetest: fix wrong written check in function write_eraseblock2

Write size in function write_eraseblock2 is subpgsize * k.
It is wrong to check whether written is equal to subpgsize after each
mtd_write.

Signed-off-by: Xiaolei Li <[e-mail]>
Reviewed-by: Richard Weinberger <[e-mail]>
Acked-by: Boris Brezillon <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/tests/subpagetest.c

···
 		if (unlikely(err || written != subpgsize * k)) {
 			pr_err("error: write failed at %#llx\n",
 			       (long long)addr);
-			if (written != subpgsize) {
+			if (written != subpgsize * k) {
 				pr_err("  write size: %#x\n",
 				       subpgsize * k);
 				pr_err("  written: %#08zx\n",