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Fix possible NULL pointer dereference when freeing blocks in case table of free space is used. Also fix handling of the case when we need to move extent from one block to another one to make space for indirect extent. BTW: Nobody seem to have ever used this code. Signed-off-by: Jan Kara <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>