btrfs: convert BUG_ON(EXTENT_BIT_LOCKED) checks to ASSERT's

We only call these functions from the qgroup code which doesn't call
with EXTENT_BIT_LOCKED.  These are BUG_ON()'s that exist to keep us
developers from using these functions with EXTENT_BIT_LOCKED, so convert
them to ASSERT()'s.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>