bugfix: 修正潜在的错误路径 (#64)

* bugfix: 修正潜在的错误路径

* 修正格式

kernel/ktest/test-bitree.c

@@ -25,6 +25,7 @@ static int compare(void *a, void *b)
 static int release(void *value)
 {
     // kdebug("release");
+    return 0;
 }
 
 /**

kernel/ktest/test-idr.c

@@ -36,7 +36,7 @@ static long ktest_idr_case0(uint64_t arg0, uint64_t arg1)
     assert(idr_pre_get(&k_idr, 0) == 0);
     assert(k_idr.id_free_cnt == IDR_FREE_MAX);
 
-    for (int i = 1; i < 64; i++)
+    for (uint64_t i = 1; i < 64; i++)
     {
         int id = __lowbit_id(i), chk_id = -1;
         for (int j = 0; j < 64; j++)

kernel/ktest/test-kfifo.c

@@ -146,6 +146,7 @@ static long ktest_kfifo_case0_1(uint64_t arg0, uint64_t arg1)
         kfifo_free_alloc(&fifo);
         assert(fifo.buffer == NULL);
     }
+    return 0;
 }
 
 static ktest_case_table kt_kfifo_func_table[] = {