fs/nilfs2: Don't search children if provided number is too large

fs/nilfs2: Don't search children if provided number is too large

NILFS2 reads the number of children a node has from the node. Unfortunately,
that's not trustworthy. Check if it's beyond what the filesystem permits and
reject it if so.

This blocks some OOB reads. I'm not sure how controllable the read is and what
could be done with invalidly read data later on.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>