leds: leds-pwm: Fix checkpatch warning

Fixes the following checkpatch warning:
WARNING: please, no space before tabs
FILE: leds/leds-pwm.c:29:
^Iunsigned int ^I^Iactive_low;$

Signed-off-by: Sachin Kamat <[e-mail]>
Signed-off-by: Bryan Wu <[e-mail]>

drivers/leds/leds-pwm.c

···
 struct led_pwm_data {
 	struct led_classdev	cdev;
 	struct pwm_device	*pwm;
-	unsigned int 		active_low;
+	unsigned int		active_low;
 	unsigned int		period;
 };