Btrfs: free btrfs_device in place

It's pointless to defer it to a kthread helper as we're not under a
special context.

For reference, commit 1f78160ce1b1 ("Btrfs: using rcu lock in the reader
side of devices list") introduced RCU freeing for device structures.

Originally the blkdev_put was called from free_device and rcu_barrier had
to be called. This is no longer required, bdev and our device structures
are now freed separately.

Signed-off-by: Liu Bo <[email protected]>
Reviewed-by: Anand Jain <[email protected]>
Reviewed-by: David Sterba <[email protected]>
[ enhance changelog ]
Signed-off-by: David Sterba <[email protected]>

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