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/syncookies.c b/net/ipv6/syncookies.c
index 535a3ad..bb53a5e7 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -247,7 +247,7 @@
 		fl6.fl6_sport = inet_sk(sk)->inet_sport;
 		security_req_classify_flow(req, flowi6_to_flowi(&fl6));
 
-		dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
+		dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
 		if (IS_ERR(dst))
 			goto out_free;
 	}