IB/ipath: Use time_before()/_after()

Time comparisons must use time_after / time_before to avoid problems
when jiffies wraps.

Signed-off-by: Manuel Schölling <manuel.schoelling@gmx.de>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --cc drivers/infiniband/hw/ipath/ipath_intr.c
Simple merge

diff --cc drivers/infiniband/hw/ipath/ipath_sdma.c
Simple merge