btrfs: inline code of reada_tree_block and remove it
It's trivial with a single user. And remove one pointless BUG_ON.
Signed-off-by: David Sterba <dsterba@suse.cz>
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It's trivial with a single user. And remove one pointless BUG_ON.
Signed-off-by: David Sterba <dsterba@suse.cz>