boot-order-test: fix memleaks in boot-order-test

It's not a big deal, but 'check qtest-ppc/ppc64' runs fail if sanitizers is enabled.
The memory leak stack is as follow:

Direct leak of 128 byte(s) in 4 object(s) allocated from:
    #0 0x7f11756f5970 in __interceptor_calloc (/lib64/libasan.so.5+0xef970)
    #1 0x7f1174f2549d in g_malloc0 (/lib64/libglib-2.0.so.0+0x5249d)
    #2 0x556af05aa7da in mm_fw_cfg_init /mnt/sdb/qemu/tests/libqos/fw_cfg.c:119
    #3 0x556af059f4f5 in read_boot_order_pmac /mnt/sdb/qemu/tests/boot-order-test.c:137
    #4 0x556af059efe2 in test_a_boot_order /mnt/sdb/qemu/tests/boot-order-test.c:47
    #5 0x556af059f2c0 in test_boot_orders /mnt/sdb/qemu/tests/boot-order-test.c:59
    #6 0x556af059f52d in test_pmac_oldworld_boot_order /mnt/sdb/qemu/tests/boot-order-test.c:152
    #7 0x7f1174f46cb9  (/lib64/libglib-2.0.so.0+0x73cb9)
    #8 0x7f1174f46b73  (/lib64/libglib-2.0.so.0+0x73b73)
    #9 0x7f1174f46b73  (/lib64/libglib-2.0.so.0+0x73b73)
    #10 0x7f1174f46f71 in g_test_run_suite (/lib64/libglib-2.0.so.0+0x73f71)
    #11 0x7f1174f46f94 in g_test_run (/lib64/libglib-2.0.so.0+0x73f94)
Reported-by: NEuler Robot <euler.robot@huawei.com>
Signed-off-by: NPan Nengyuan <pannengyuan@huawei.com>
Message-Id: <20200203025935.36228-1-pannengyuan@huawei.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>

tests/qtest/boot-order-test.c

@@ -110,7 +110,7 @@ static void test_pc_boot_order(void)
 
 static uint64_t read_boot_order_pmac(QTestState *qts)
 {
-    QFWCFG *fw_cfg = mm_fw_cfg_init(qts, 0xf0000510);
+    g_autoptr(QFWCFG) fw_cfg = mm_fw_cfg_init(qts, 0xf0000510);
 
     return qfw_cfg_get_u16(fw_cfg, FW_CFG_BOOT_DEVICE);
 }
@@ -135,7 +135,7 @@ static void test_pmac_newworld_boot_order(void)
 
 static uint64_t read_boot_order_sun4m(QTestState *qts)
 {
-    QFWCFG *fw_cfg = mm_fw_cfg_init(qts, 0xd00000510ULL);
+    g_autoptr(QFWCFG) fw_cfg = mm_fw_cfg_init(qts, 0xd00000510ULL);
 
     return qfw_cfg_get_u16(fw_cfg, FW_CFG_BOOT_DEVICE);
 }
@@ -147,7 +147,7 @@ static void test_sun4m_boot_order(void)
 
 static uint64_t read_boot_order_sun4u(QTestState *qts)
 {
-    QFWCFG *fw_cfg = io_fw_cfg_init(qts, 0x510);
+    g_autoptr(QFWCFG) fw_cfg = io_fw_cfg_init(qts, 0x510);
 
     return qfw_cfg_get_u16(fw_cfg, FW_CFG_BOOT_DEVICE);
 }

tests/qtest/libqos/fw_cfg.h

@@ -49,4 +49,6 @@ static inline void pc_fw_cfg_uninit(QFWCFG *fw_cfg)
     io_fw_cfg_uninit(fw_cfg);
 }
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(QFWCFG, mm_fw_cfg_uninit)
+
 #endif