xtensa: set proper error code for simdisk_setup()

Change error code to -ENOMEM from -EIO because
the error is related to memory allocating.

Signed-off-by: Chengguang Xu <cgxu519@gmail.com>
Message-Id: <1557066367-4783-2-git-send-email-cgxu519@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/platforms/iss/simdisk.c

@@ -297,7 +297,7 @@ out_alloc_disk:
 	blk_cleanup_queue(dev->queue);
 	dev->queue = NULL;
 out_alloc_queue:
-	return -EIO;
+	return -ENOMEM;
 }
 
 static int __init simdisk_init(void)