ospfd: Make ospf_passive_interface_update calls friendly to static analysis

ospfd: Make ospf_passive_interface_update calls friendly to static analysis

* ospf_vty.c: ({no_}ospf_passive_interface_addr_cmd) To a static analyser,
  the call to ospf_passive_interface_update can look like uninitialised memory
  in addr might be read from. It won't be, as ospf_passive_interface_update
  only reads addr if params != IF_DEF_PARAMS, but not clear. Split up the
  helper into the two cases to make it clear.

(cherry picked from commit e1bcd4741c24ff990a9413ead9a9e37b80153046)