f2fs: introduce f2fs_wait_discard_bios

Split f2fs_wait_discard_bios from f2fs_wait_discard_bio, just for cleanup,
no logic change.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
3 files changed