netns xfrm: pass netns with KM notifications

SA and SPD flush are executed with NULL SA and SPD respectively, for
these cases pass netns explicitly from userspace socket.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/key/af_key.c b/net/key/af_key.c
index a0d8498..ea7755ab 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1739,6 +1739,7 @@
 	c.seq = hdr->sadb_msg_seq;
 	c.pid = hdr->sadb_msg_pid;
 	c.event = XFRM_MSG_FLUSHSA;
+	c.net = &init_net;
 	km_state_notify(NULL, &c);
 
 	return 0;
@@ -2693,6 +2694,7 @@
 	c.event = XFRM_MSG_FLUSHPOLICY;
 	c.pid = hdr->sadb_msg_pid;
 	c.seq = hdr->sadb_msg_seq;
+	c.net = &init_net;
 	km_policy_notify(NULL, 0, &c);
 
 	return 0;