dhcp_manager: Fix dnsmasq call back

When dnsmasq calls back, it can optionally give more arguments. We don't
care about the optional arguments, but we shouldn't fail when there's
one.

BUG=None
TEST=None

Change-Id: Ief664f3903ee68a5deefe225b46b7f6c97be93b1
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/252223
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
1 file changed