minor fixes

Author: kumaraditya303

Lib/test/test_capi/test_misc.py

@@ -1557,9 +1557,6 @@ def callback():
 
         for i in range(n):
             time.sleep(random.random()*0.02) #0.01 secs on average
-            #try submitting callback until successful.
-            #rely on regular interrupt to flush queue if we are
-            #unsuccessful.
             self.assertTrue(_testcapi._pending_threadfunc(callback))
 
     def pendingcalls_submit(self, l, n, *, main=True):

Python/ceval_gil.c

@@ -729,13 +729,8 @@ push_pending_call(struct _pending_calls *pending,
     call->arg = arg;
     call->func = func;
     call->flags = flags;
-    call->next = NULL;
-
-    _pending_call **head = &pending->head;
-    while (*head) {
-        head = &(*head)->next;
-    }
-    *head = call;
+    call->next = pending->head;
+    pending->head = call;
     _Py_atomic_add_int32(&pending->npending, 1);
     return 0;
 }