spi: No need to assign dummy value in spi_unregister_controller()

The device_for_each_child() doesn't require the returned value to be checked.
Thus, drop the dummy variable completely and have no warning anymore:

drivers/spi/spi.c: In function ‘spi_unregister_controller’:
drivers/spi/spi.c:2480:6: warning: variable ‘dummy’ set but not used [-Wunused-but-set-variable]
  int dummy;
      ^~~~~

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 498f9b7..e71881a 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2559,7 +2559,6 @@ void spi_unregister_controller(struct spi_controller *ctlr)
 {
        struct spi_controller *found;
        int id = ctlr->bus_num;
-       int dummy;
 
        /* First make sure that this controller was ever added */
        mutex_lock(&board_lock);
@@ -2573,7 +2572,7 @@ void spi_unregister_controller(struct spi_controller *ctlr)
        list_del(&ctlr->list);
        mutex_unlock(&board_lock);
 
-       dummy = device_for_each_child(&ctlr->dev, NULL, __unregister);
+       device_for_each_child(&ctlr->dev, NULL, __unregister);
        device_unregister(&ctlr->dev);
        /* free bus id */
        mutex_lock(&board_lock);