mtd: core: Align comment with an action in mtd_otp_nvmem_add()

The comment is related to the non-error case, make it more clear
by inverting the condition. It also makes code neater at the end.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240325151150.3368658-1-andriy.shevchenko@linux.intel.com

drivers/mtd/mtdcore.c

@@ -1015,10 +1015,9 @@ static int mtd_otp_nvmem_add(struct mtd_info *mtd)
 err:
 	nvmem_unregister(mtd->otp_user_nvmem);
 	/* Don't report error if OTP is not supported. */
-	if (err != -EOPNOTSUPP)
-		return dev_err_probe(dev, err,
-				     "Failed to register OTP NVMEM device\n");
-	return 0;
+	if (err == -EOPNOTSUPP)
+		return 0;
+	return dev_err_probe(dev, err, "Failed to register OTP NVMEM device\n");
 }
 
 /**