f2fs: speed up shrinking extent tree entries
If there is no candidates for shrinking slab entries, we don't need to traverse any trees at all. Reviewed-by: NChao Yu <chao2.yu@samsung.com> [Jaegeuk Kim: fix missing initialization reported by Yunlei He] Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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