[POWERPC] properly declare onstack completion in iseries veth

The iSeries veth driver uses an on-stack struct completion that
it initializes using the COMPLETION_INITIALIZER instead of
COMPLETION_INITIALIZER_ONSTACK macro, causing problems with
lockdep.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

drivers/net/iseries_veth.c

@@ -308,7 +308,8 @@ static void veth_complete_allocation(void *parm, int number)
 
 static int veth_allocate_events(HvLpIndex rlp, int number)
 {
-	struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
+	struct veth_allocation vc =
+		{ COMPLETION_INITIALIZER_ONSTACK(vc.c), 0 };
 
 	mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
 			    sizeof(struct veth_lpevent), number,