Blackfin SPI driver: tweak spi cleanup function to match newer kernel changes

Signed-off-by: NMike Frysinger <michael.frysinger@analog.com>
Signed-off-by: NBryan Wu <bryan.wu@analog.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>

drivers/spi/spi_bfin5xx.c

@@ -1082,7 +1082,7 @@ static int setup(struct spi_device *spi)
  */
 static void cleanup(struct spi_device *spi)
 {
-	struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
+	struct chip_data *chip = spi_get_ctldata(spi);
 
 	kfree(chip);
 }