netlink: rename ssk to sk in struct netlink_skb_params

Memory mapped netlink needs to store the receiving userspace socket
when sending from the kernel to userspace. Rename 'ssk' to 'sk' to
avoid confusion.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index aa36a8c..7881e2f 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -393,7 +393,7 @@
 			return -EOPNOTSUPP;
 
 		if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
-		    sk_user_ns(NETLINK_CB(in_skb).ssk) != &init_user_ns)
+		    sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
 			return -EOPNOTSUPP;
 	}