nvmet: fix a spelling mistake "nubmer" -> "number"

There is a spelling mistake in a pr_err error message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/target/configfs.c

@@ -1150,7 +1150,7 @@ static ssize_t nvmet_subsys_attr_model_store_locked(struct nvmet_subsys *subsys,
 		return -EINVAL;
 
 	if (len > NVMET_MN_MAX_SIZE) {
-		pr_err("Model nubmer size can not exceed %d Bytes\n",
+		pr_err("Model number size can not exceed %d Bytes\n",
 		       NVMET_MN_MAX_SIZE);
 		return -EINVAL;
 	}