Don't call NetlinkCallbacks with nullptr on NLMSG_DONE.

No real callback uses this, and even the test code doesn't seem
to use it for anything useful.

Bug: 34873832
Test: bullhead builds, boots, rules flushed on netd restart
Test: netd_{unit,integration}_test pass
Change-Id: I195dd388864e9e596af9f4d08aee7b8ade078fb5
4 files changed
tree: 56fc6e5092224e7e579b28fc37525eeb5881083d
  1. client/
  2. include/
  3. server/
  4. tests/
  5. Android.mk
  6. MODULE_LICENSE_APACHE2
  7. NOTICE