jfs: fix array-index-out-of-bounds in diAlloc

mainline inclusion
from mainline-v6.7-rc1
commit 05d9ea1ceb62a55af6727a69269a4fd310edf483
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFMU
CVE: CVE-2023-52805

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05d9ea1ceb62a55af6727a69269a4fd310edf483



--------------------------------

Currently there is not check against the agno of the iag while
allocating new inodes to avoid fragmentation problem. Added the check
which is required.

Reported-by:  <syzbot+79d792676d8ac050949f@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=79d792676d8ac050949f


Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>