net: Remove FLOWI_FLAG_CAN_SLEEP

FLOWI_FLAG_CAN_SLEEP was used to notify xfrm about the posibility
to sleep until the needed states are resolved. This code is gone,
so FLOWI_FLAG_CAN_SLEEP is not needed anymore.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index a83243c..15d23b8 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -145,7 +145,7 @@
 	else if (!fl6.flowi6_oif)
 		fl6.flowi6_oif = np->ucast_oif;
 
-	dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr, 1);
+	dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr);
 	if (IS_ERR(dst))
 		return PTR_ERR(dst);
 	rt = (struct rt6_info *) dst;