Oops! Remove a tight-looping diagnostic.

I temporarily applied it as a means of testing the revised event loops
in r10040, and accidentally folded it into my final commit instead of
backing it out. Ahem.

[originally from svn r10042]
[r10040 == 5c4ce2fadf]

callback.c

@@ -26,28 +26,10 @@ void request_callback_notifications(toplevel_callback_notify_fn_t fn,
     frontend = fr;
 }
 
-void stoat_callback(void *ctx)
-{
-    static int stoat = 0;
-    if (++stoat % 1000 == 0)
-        debug(("stoat %d\n", stoat));
-    queue_toplevel_callback(stoat_callback, NULL);
-}
-void queue_stoat(void)
-{
-    static int stoat = 0;
-    if (!stoat) {
-        stoat = 1;
-        queue_toplevel_callback(stoat_callback, NULL);
-    }
-}
-
 void queue_toplevel_callback(toplevel_callback_fn_t fn, void *ctx)
 {
     struct callback *cb;
 
-    queue_stoat();
-
     cb = snew(struct callback);
     cb->fn = fn;
     cb->ctx = ctx;
@@ -68,7 +50,6 @@ void queue_toplevel_callback(toplevel_callback_fn_t fn, void *ctx)
 
 void run_toplevel_callbacks(void)
 {
-    queue_stoat();
     if (cbhead) {
         struct callback *cb = cbhead;
         /*
@@ -89,6 +70,5 @@ void run_toplevel_callbacks(void)
 
 int toplevel_callback_pending(void)
 {
-    queue_stoat();
     return cbhead != NULL;
 }