sunrpc: handle -ENOTCONN in xs_tcp_setup_socket()

xs_tcp_finish_connecting() can return -ENOTCONN but the switch statement
in xs_tcp_setup_socket() treats that as an unhandled error.

If we treat it as a known error it would propagate back to
call_connect_status() which does handle that error code.  This appears
to be the intention of the commit (given below) which added -ENOTCONN as
a return status for xs_tcp_finish_connecting().

So add -ENOTCONN to the switch statement as an error to pass through to
the caller.

Link: https://bugzilla.suse.com/show_bug.cgi?id=1231050
Link: https://access.redhat.com/discussions/3434091
Fixes: 01d37c4 ("SUNRPC: xprt_connect() don't abort the task if the transport isn't bound")
Signed-off-by: NeilBrown <[email protected]>
Reviewed-by: Benjamin Coddington <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>

Author: neilbrown

net/sunrpc/xprtsock.c

@@ -2459,6 +2459,7 @@ static void xs_tcp_setup_socket(struct work_struct *work)
 	case -EHOSTUNREACH:
 	case -EADDRINUSE:
 	case -ENOBUFS:
+	case -ENOTCONN:
 		break;
 	default:
 		printk("%s: connect returned unhandled error %d\n",