f2fs: Use DIV_ROUND_UP() instead of open-coding
Replace the open-coded divisions with round-up by calls to the DIV_ROUND_UP() helper macro. Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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