IB/ipath: Fix count of packets received by kernel

The loop in ipath_kreceive() that processes packets increments the
loop-index 'i' once too often, because the exit condition does not
depend on it, and is checked after the increment. By adding a check for
!last to the iterator in the for loop, we correct that in a way that is
not so likely to be re-broken by changes in the loop body.
Signed-off-by: Michael Albaugh <micheal.albaugh@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ipath/ipath_driver.c

@@ -1197,7 +1197,7 @@ void ipath_kreceive(struct ipath_portdata *pd)
 	}
 
 reloop:
-	for (last = 0, i = 1; !last; i++) {
+	for (last = 0, i = 1; !last; i += !last) {
 		hdr = dd->ipath_f_get_msgheader(dd, rhf_addr);
 		eflags = ipath_hdrget_err_flags(rhf_addr);
 		etype = ipath_hdrget_rcv_type(rhf_addr);