greybus: connection: Propagate error properly

We just got an error, propagate the exact return value instead of 0.
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>

drivers/staging/greybus/connection.c

@@ -384,7 +384,7 @@ static int gb_connection_init(struct gb_connection *connection)
 			dev_err(&connection->dev,
 				"Failed to connect CPort-%d (%d)\n",
 				cport_id, ret);
-			return 0;
+			return ret;
 		}
 	}