iphase: Fix 64bit warning.

Time is unsigned long (except when you are in a hurry) so we need to
store rx_tmp_jif in the right sized object.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>