liblights: Fix fast blinking notification LEDs.

Seems that the fast blinking notification LEDs experienced on some
Samsung devices was due to the removal of these two lines that clean
the 'blink' array. Propose re-inserting to correct the fast blinking
LED issue.

Change-Id: I88ea828a50468aae494b1dd54290607308de543a

liblights/lights.c

@@ -199,6 +199,10 @@ static int write_leds(const struct led_config *led)
     ALOGV("%s: color=0x%08x, delay_on=%d, delay_off=%d, blink=%s",
           __func__, led->color, led->delay_on, led->delay_off, blink);
 
+    /* Add '\n' here to make the above log message clean. */
+    blink[count]   = '\n';
+    blink[count+1] = '\0';
+
     pthread_mutex_lock(&g_lock);
     err = write_str(LED_BLINK_NODE, blink);
     pthread_mutex_unlock(&g_lock);