mfd: arizona-spi: Add lines after declarations - checkpatch catch

This was found whilst running checkpatch.pl on arizona-spi.

WARNING: Missing a blank line after declarations
+       struct arizona *arizona = spi_get_drvdata(spi);
+       arizona_dev_exit(arizona);

Signed-off-by: Will Sheppard <wsheppard@embedded-bits.co.uk>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
index 5145d78..8ef58bc 100644
--- a/drivers/mfd/arizona-spi.c
+++ b/drivers/mfd/arizona-spi.c
@@ -75,7 +75,9 @@
 static int arizona_spi_remove(struct spi_device *spi)
 {
 	struct arizona *arizona = spi_get_drvdata(spi);
+
 	arizona_dev_exit(arizona);
+
 	return 0;
 }