rds: make local functions/variables static

The RDS protocol has lots of functions that should be
declared static. rds_message_get/add_version_extension is
removed since it defined but never used.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/page.c b/net/rds/page.c
index 5e44f5a..a3e2e0a 100644
--- a/net/rds/page.c
+++ b/net/rds/page.c
@@ -40,7 +40,8 @@
 	unsigned long	r_offset;
 };
 
-DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_page_remainder, rds_page_remainders);
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_page_remainder,
+				     rds_page_remainders);
 
 /*
  * returns 0 on success or -errno on failure.