[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>
diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index b038a0a..0197a41 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -262,7 +262,7 @@
 }
 
 /* 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);