ionic: change the hwstamp likely check

An earlier change moved the hwstamp queue check into a helper
function with an unlikely(). However, it makes more sense for
the caller to decide if it's likely() or unlikely(), so make
the change to support that.

Signed-off-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>