ospfd: Solved crash in OSPF TE parsing

Iggy Frankovic discovered an ospfd crash when perfomring fuzzing of OSPF LSA
packets. The crash occurs in ospf_te_parse_te() function when attemping to
create corresponding egde from TE Link parameters. If there is no local
address, an edge is created but without any attributes. During parsing, the
function try to access to this attribute fields which has not been created
causing an ospfd crash.

The patch simply check if the te parser has found a valid local address. If not
found, we stop the parser which avoid the crash.

Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>

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