f2fs: clean up with is_valid_blkaddr()

f2fs: clean up with is_valid_blkaddr()

commit 7b525dd01365c6764018e374d391c92466be1b7a upstream.

- rename is_valid_blkaddr() to is_valid_meta_blkaddr() for readability.
- introduce is_valid_blkaddr() for cleanup.

No logic change in this patch.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[bwh: Backported to 4.4:
 - Drop inapplicable change to check on f2fs_fio_info::old_blkaddr
 - Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>