regulator: wm8350: Remove unused variable

Commit 8f45acb5f9f34eab ("regulator: wm8350: Pass NULL data with REGULATION_OUT
and UNDER_VOLTAGE events") introduced the following build warning:

drivers/regulator/wm8350-regulator.c: In function 'pmic_uv_handler':
drivers/regulator/wm8350-regulator.c:1154:17: warning: unused variable 'wm8350' [-Wunused-variable]

Remove 'wm8350' as it is unused now.

Signed-off-by: Fabio Estevam <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/wm8350-regulator.c

···
 static irqreturn_t pmic_uv_handler(int irq, void *data)
 {
 	struct regulator_dev *rdev = (struct regulator_dev *)data;
-	struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
 
 	mutex_lock(&rdev->mutex);
 	if (irq == WM8350_IRQ_CS1 || irq == WM8350_IRQ_CS2)