src:arduino-timer: make ticks calculation optional

Use tick<void>() instead of tick() to avoid calculating the ticks count.

loop {
    timer.tick<void>(); // avoids ticks() calculation
}

Author: contrem

src/arduino-timer.h

@@ -99,6 +99,13 @@ class Timer {
     /* Ticks the timer forward - call this function in loop() */
     unsigned long
     tick()
+    {
+        tick<void>();
+        return ticks();
+    }
+
+    template <typename R> void
+    tick()
     {
         for (size_t i = 0; i < max_tasks; ++i) {
             struct task * const task = &tasks[i];
@@ -115,8 +122,6 @@ class Timer {
                 }
             }
         }
-
-        return ticks();
     }
 
     /* Ticks until the next event */