RDS: inc_purge() transport function unused - remove it

Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/iw_recv.c b/net/rds/iw_recv.c
index 48bcf4f..7e929f7 100644
--- a/net/rds/iw_recv.c
+++ b/net/rds/iw_recv.c
@@ -273,7 +273,7 @@
 	return ret;
 }
 
-void rds_iw_inc_purge(struct rds_incoming *inc)
+static void rds_iw_inc_purge(struct rds_incoming *inc)
 {
 	struct rds_iw_incoming *iwinc;
 	struct rds_page_frag *frag;