fix the boundary check

..so that changing fadeAmount (to, say, 7) doesn't break the algorithm making an infinit loop (see #5115)

Author: YakovL

build/shared/examples/01.Basics/Fade/Fade.ino

@@ -32,8 +32,8 @@ void loop() {
   brightness = brightness + fadeAmount;
 
   // reverse the direction of the fading at the ends of the fade:
-  if (brightness == 0 || brightness == 255) {
-    fadeAmount = -fadeAmount ;
+  if (brightness <= 0 || brightness >= 255) {
+    fadeAmount = -fadeAmount;
   }
   // wait for 30 milliseconds to see the dimming effect
   delay(30);