f2fs: use MAX_BIO_BLOCKS(sbi)

This patch cleans up a simple macro.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --cc fs/f2fs/checkpoint.c
Simple merge

diff --cc fs/f2fs/data.c
Simple merge

diff --cc fs/f2fs/node.c
Simple merge

diff --cc fs/f2fs/segment.c
Simple merge

diff --cc fs/f2fs/segment.h
Simple merge