btrfs: change BUG_ON to assertion in tree_move_down()
[ Upstream commit 56f335e0 ] There's only one caller of tree_move_down() that does not pass level 0 so the assertion is better suited here. Signed-off-by:David Sterba <dsterba@suse.com> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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