drm/omap: fix unused variable warning.

Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -101,7 +101,6 @@ static irqreturn_t hdmi_irq_handler(int irq, void *data)
 
 static int hdmi_init_regulator(void)
 {
-	int r;
 	struct regulator *reg;
 
 	if (hdmi.vdda_reg != NULL)