drivers/video/backlight/kb3886_bl.c: use usleep_range() instead of msleep() for small sleeps

Since msleep() might not sleep for the desired amount when less than 20ms,
use usleep_range().

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Claudio Nieder <private@claudio.ch>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/backlight/kb3886_bl.c

@@ -34,9 +34,9 @@ static void kb3886_bl_set_intensity(int intensity)
 	mutex_lock(&bl_mutex);
 	intensity = intensity&0xff;
 	outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
-	msleep(10);
+	usleep_range(10000, 11000);
 	outb(KB3886_PWM0_WRITE, KB3886_IO);
-	msleep(10);
+	usleep_range(10000, 11000);
 	outb(intensity, KB3886_IO);
 	mutex_unlock(&bl_mutex);
 }