Merge pull request #287 from DavidLin1577/patch-6

mini optimize the tos_sem.c

kernel/core/tos_sem.c

@@ -22,9 +22,14 @@
 __API__ k_err_t tos_sem_create_max(k_sem_t *sem, k_sem_cnt_t init_count, k_sem_cnt_t max_count)
 {
     TOS_PTR_SANITY_CHECK(sem);
-
+    
+    if (unlikely(init_count > max_count)) {
+        init_count = max_count;
+    }
+    
     sem->count      = init_count;
     sem->count_max  = max_count;
+    
     pend_object_init(&sem->pend_obj);
     TOS_OBJ_INIT(sem, KNL_OBJ_TYPE_SEMAPHORE);