Btrfs: Fix typo in fs/btrfs

Correct spelling typo in btrfs.
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

fs/btrfs/ctree.h

@@ -413,7 +413,7 @@ struct btrfs_root_backup {
 	__le64 bytes_used;
 	__le64 num_devices;
 	/* future */
-	__le64 unsed_64[4];
+	__le64 unused_64[4];
 
 	u8 tree_root_level;
 	u8 chunk_root_level;

fs/btrfs/volumes.c

@@ -4261,7 +4261,7 @@ static void submit_stripe_bio(struct btrfs_root *root, struct btrfs_bio *bbio,
 
 		rcu_read_lock();
 		name = rcu_dereference(dev->name);
-		pr_debug("btrfs_map_bio: rw %d, secor=%llu, dev=%lu "
+		pr_debug("btrfs_map_bio: rw %d, sector=%llu, dev=%lu "
 			 "(%s id %llu), size=%u\n", rw,
 			 (u64)bio->bi_sector, (u_long)dev->bdev->bd_dev,
 			 name->str, dev->devid, bio->bi_size);