Fix memory leaks and heap buffer overflow in test_thread-pool.

common/utils/threadPool/thread-pool.h

@@ -336,7 +336,9 @@ static inline int abortTpool(tpool_t *t) {
   thread = t->allthreads;
   while (thread != NULL) {
     pthread_cancel(thread->threadID);
-    thread = thread->next;
+    struct one_thread *next = thread->next;
+    free(thread);
+    thread = next;
   }
 
   return nbRemoved;