[DCCP]: make dccp_write_xmit_timer() static again

dccp_write_xmit_timer() needlessly became global.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dccp/dccp.h

@@ -191,7 +191,6 @@ extern void dccp_send_sync(struct sock *sk, const u64 seq,
 			   const enum dccp_pkt_type pkt_type);
 
 extern void dccp_write_xmit(struct sock *sk, int block);
-extern void dccp_write_xmit_timer(unsigned long data);
 extern void dccp_write_space(struct sock *sk);
 
 extern void dccp_init_xmit_timers(struct sock *sk);

net/dccp/timer.c

@@ -262,7 +262,7 @@ out:
 }
 
 /* Transmit-delay timer: used by the CCIDs to delay actual send time */
-void dccp_write_xmit_timer(unsigned long data)
+static void dccp_write_xmit_timer(unsigned long data)
 {
 	struct sock *sk = (struct sock *)data;
 	struct dccp_sock *dp = dccp_sk(sk);