peer: fix removal of incomplete and negative cache entries
peer: fix removal of incomplete and negative cache entries

We should not udpate kernel about these: the incomplete entry
can be an off-NBMA network address, and the negative entry has
been previously updated when it was inserted to peer cache. No
need to re-report NUD_FAILED.

ibazzi/opennhrp,ibazzi/opennhrp,ibazzi/opennhrp