UBIFS: clean up free space checking
recovery.c has 'is_empty()' helper and it is better to use this helper instead of re-implementing it in several places. This patch does this and removes some amount of unneeded code. Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com> Reviewed-by: NAdrian Hunter <Adrian.Hunter@nokia.com>
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