mptcp: add __init annotation on setup functions

Add the missing annotation in some setup-only
functions.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3980fbb..9163a05 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2077,7 +2077,7 @@ static struct inet_protosw mptcp_protosw = {
 	.flags		= INET_PROTOSW_ICSK,
 };
 
-void mptcp_proto_init(void)
+void __init mptcp_proto_init(void)
 {
 	mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo;
 
@@ -2139,7 +2139,7 @@ static struct inet_protosw mptcp_v6_protosw = {
 	.flags		= INET_PROTOSW_ICSK,
 };
 
-int mptcp_proto_v6_init(void)
+int __init mptcp_proto_v6_init(void)
 {
 	int err;