isisd: fix crash when reading asla

isisd: fix crash when reading asla

isisd is crashing when reading a ASLA sub-TLV with Application
Identifier Bit Mask length greater than 1 octet.

Set a limit of 8 bytes in accordance with RFC9479 and check that the
received value does not exceed the limit.

Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Link: https://www.rfc-editor.org/rfc/rfc9479.html#name-application-identifier-bit-
Fixes: 5749ac83a8 ("isisd: add ASLA support")
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
(cherry picked from commit f1bc6c5d81e8cc0d31ee61abb295193f30db4f5a)