Fix #2768 - remove completed timers

src/timer.c

@@ -1,11 +1,9 @@
-#include "timer.h"
 #include "arch.h"
-
-#define MG_TIMER_CALLED 4
+#include "timer.h"
 
 void mg_timer_init(struct mg_timer **head, struct mg_timer *t, uint64_t ms,
                    unsigned flags, void (*fn)(void *), void *arg) {
-  t->id = 0, t->period_ms = ms, t->expire = 0;
+  t->period_ms = ms, t->expire = 0;
   t->flags = flags, t->fn = fn, t->arg = arg, t->next = *head;
   *head = t;
 }
@@ -36,5 +34,11 @@ void mg_timer_poll(struct mg_timer **head, uint64_t now_ms) {
       t->fn(t->arg);
     }
     t->flags |= MG_TIMER_CALLED;
+
+    // If this timer is not repeating and marked AUTODELETE, remove it
+    if (!(t->flags & MG_TIMER_REPEAT) && (t->flags & MG_TIMER_AUTODELETE)) {
+      mg_timer_free(head, t);
+      free(t);
+    }
   }
 }