mtd: utilize `mtd_is_*()' functions

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
diff --git a/drivers/mtd/tests/mtd_readtest.c b/drivers/mtd/tests/mtd_readtest.c
index 587e1e3..7560453 100644
--- a/drivers/mtd/tests/mtd_readtest.c
+++ b/drivers/mtd/tests/mtd_readtest.c
@@ -75,7 +75,7 @@
 			ops.datbuf    = NULL;
 			ops.oobbuf    = oobbuf;
 			ret = mtd->read_oob(mtd, addr, &ops);
-			if ((ret && ret != -EUCLEAN) ||
+			if ((ret && !mtd_is_bitflip(ret)) ||
 					ops.oobretlen != mtd->oobsize) {
 				printk(PRINT_PREF "error: read oob failed at "
 						  "%#llx\n", (long long)addr);