rdma: potential ERR_PTR dereference

In the original code, the "goto out" calls "rdma_destroy_id(cm_id);"
That isn't needed here and would cause problems because "cm_id" is an
ERR_PTR.  The new code just returns directly.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Acked-by: NAndy Grover <andy.grover@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/rdma_transport.c

@@ -134,7 +134,7 @@ static int __init rds_rdma_listen_init(void)
 		ret = PTR_ERR(cm_id);
 		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
 		       "rdma_create_id() returned %d\n", ret);
-		goto out;
+		return ret;
 	}
 
 	sin.sin_family = AF_INET,