UBIFS: fix the dark space calculation
The dark space calculation should be 64 bit type-casted, when assigning to tmp64 (similar to how total_free is calculated). Overflow will occur for very large flashes. Signed-off-by: Nsrimugunthan <srimugunthan.dhandapani@gmail.com> Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@intel.com>
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