btrfs: improve error handling in run_delalloc_nocow
Correctly handle failure cases when adding an ordered extents in case of REGULAR or PREALLOC extents. Remove the BUG_ON. Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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