rtnetlink: Remove redundtant hasExpired() check
rtnetlink: Remove redundtant hasExpired() check

We don't need to check if the timer is expired and enabled because the
timer will never be expired if it is enabled.

Tested:
    Built and networkd still receives link state transitions and
    populates the discovered ip addresses correctly.

Change-Id: I066842af9046190541f868d25319016f34012de3
Signed-off-by: William A. Kennington III <30fff5198f4d10ca1117e5f3ec82f3b4b8900d81@google.com>

openbmc/phosphor-networkd,openbmc/phosphor-networkd