jfs: fix shift-out-of-bounds in dbJoin
Currently while joining the leaf in a buddy system there is shift out of bound error in calculation of BUDSIZE. Added the required check to the BUDSIZE and fixed the documentation as well. Reported-by: <syzbot+411debe54d318eaed386@syzkaller.appspotmail.com> Closes: https://syzkaller.appspot.com/bug?extid=411debe54d318eaed386 Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
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