Fix a fundamental extent_split_wrapper() bug in an error path. Fix extent_recycle() to deregister unsplittable extents before leaking them. Relax xallocx() test assertions so that unsplittable extents don't cause test failures.
Fix a fundamental extent_split_wrapper() bug in an error path. Fix extent_recycle() to deregister unsplittable extents before leaking them. Relax xallocx() test assertions so that unsplittable extents don't cause test failures.