gma500@ Fix backlight range error

If we go out of range we break the pm counts on the error path

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/gma500/mrst_device.c

@@ -157,14 +157,12 @@ static int device_backlight_init(struct drm_device *dev)
 	value /= bl_max_freq;
 	value /= blc_pwm_precision_factor;
 
+	if (value > (unsigned long long)MRST_BLC_MAX_PWM_REG_FREQ)
+			return -ERANGE;
+
 	if (gma_power_begin(dev, false)) {
-		if (value > (unsigned long long)MRST_BLC_MAX_PWM_REG_FREQ)
+		REG_WRITE(BLC_PWM_CTL2, (0x80000000 | REG_READ(BLC_PWM_CTL2)));
-				return -ERANGE;
+		REG_WRITE(BLC_PWM_CTL, value | (value << 16));
-		else {
-			REG_WRITE(BLC_PWM_CTL2,
-					(0x80000000 | REG_READ(BLC_PWM_CTL2)));
-			REG_WRITE(BLC_PWM_CTL, value | (value << 16));
-		}
 		gma_power_end(dev);
 	}
 	return 0;