xprtrdma: Use re_connect_status safely in rpcrdma_xprt_connect()

Clean up: Sometimes creating a fresh rpcrdma_ep can fail. That's why
xprt_rdma_connect() always checks if the r_xprt->rx_ep pointer is
valid before dereferencing it. Instead, xprt_rdma_connect() can
simply check rpcrdma_xprt_connect()'s return value.

Also, there's no need to set re_connect_status to zero just after
the rpcrdma_ep is created, since it is allocated with kzalloc.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

net/sunrpc/xprtrdma/transport.c

@@ -242,7 +242,7 @@ xprt_rdma_connect_worker(struct work_struct *work)
 
 	rc = rpcrdma_xprt_connect(r_xprt);
 	xprt_clear_connecting(xprt);
-	if (r_xprt->rx_ep && r_xprt->rx_ep->re_connect_status > 0) {
+	if (!rc) {
 		xprt->connect_cookie++;
 		xprt->stat.connect_count++;
 		xprt->stat.connect_time += (long)jiffies -

net/sunrpc/xprtrdma/verbs.c

@@ -528,7 +528,6 @@ int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt)
 		return rc;
 	ep = r_xprt->rx_ep;
 
-	ep->re_connect_status = 0;
 	xprt_clear_connected(xprt);
 	rpcrdma_reset_cwnd(r_xprt);
 
@@ -565,8 +564,6 @@ int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt)
 	rpcrdma_mrs_create(r_xprt);
 
 out:
-	if (rc)
-		ep->re_connect_status = rc;
 	trace_xprtrdma_connect(r_xprt, rc);
 	return rc;
 }