[PATCH] aoe 5/12: don't try to free null bufpool

don't try to free null bufpool
Signed-off-by: NEd L. Cashin <ecashin@coraid.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/block/aoe/aoedev.c

@@ -146,7 +146,8 @@ aoedev_freedev(struct aoedev *d)
 		put_disk(d->gd);
 	}
 	kfree(d->frames);
-	mempool_destroy(d->bufpool);
+	if (d->bufpool)
+		mempool_destroy(d->bufpool);
 	kfree(d);
 }