mfd: arizona-i2c: Add blank line formatting after declaration

WARNING: Missing a blank line after declarations
+       struct arizona *arizona = dev_get_drvdata(&i2c->dev);
+       arizona_dev_exit(arizona);

total: 0 errors, 1 warnings, 120 lines checked

Cc: patches@opensource.wolfsonmicro.com
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>