[NETLINK] genetlink: fix cmd type in genl_ops to be consistent to u8

Signed-off-by: Per Liden <per.liden@ericsson.com>
ACKed-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 287cfcc..3b13784 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -441,7 +441,7 @@
 }
 
 static struct sk_buff *ctrl_build_msg(struct genl_family *family, u32 pid,
-				      int seq, int cmd)
+				      int seq, u8 cmd)
 {
 	struct sk_buff *skb;
 	int err;