RDS: inc_purge() transport function unused - remove it

Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c
index d0ee9c1..e294d00 100644
--- a/net/rds/ib_recv.c
+++ b/net/rds/ib_recv.c
@@ -273,7 +273,7 @@
 	return ret;
 }
 
-void rds_ib_inc_purge(struct rds_incoming *inc)
+static void rds_ib_inc_purge(struct rds_incoming *inc)
 {
 	struct rds_ib_incoming *ibinc;
 	struct rds_page_frag *frag;