[ospfd] Fix a few LSA performance "bugs"

ospf_lsa_install() will calculate LSA checksum so no
need to do it before calling ospf_lsa_install().

Set the OSPF_LSA_SELF_CHECKED flag on own LSA's to
save ospf_lsa_is_self_originated() some work.

Do not memset() memory that is about to overwritten
with memcpy().
1 file changed