[PATCH-for-5.2? 1/2] tests/qtest: variable defined by g_autofree need to be initialized

[Chen Qun <kuhn.chenqun@huawei.com>]

According to the glib function requirements, we need initialise
 the variable. Otherwise there will be compilation warnings:

glib-autocleanups.h:28:3: warning: ‘full_name’ may be
used uninitialized in this function [-Wmaybe-uninitialized]
   28 |   g_free (*pp);
      |   ^~~~~~~~~~~~

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
---
 tests/qtest/npcm7xx_timer-test.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tests/qtest/npcm7xx_timer-test.c b/tests/qtest/npcm7xx_timer-test.c
index f08b0cd62a..83774a5b90 100644
--- a/tests/qtest/npcm7xx_timer-test.c
+++ b/tests/qtest/npcm7xx_timer-test.c
@@ -512,11 +512,9 @@ static void test_disable_on_expiration(gconstpointer test_data)
  */
 static void tim_add_test(const char *name, const TestData *td, GTestDataFunc fn)
 {
-    g_autofree char *full_name;
-
-    full_name = g_strdup_printf("npcm7xx_timer/tim[%d]/timer[%d]/%s",
-                                tim_index(td->tim), timer_index(td->timer),
-                                name);
+    g_autofree char *full_name = g_strdup_printf(
+        "npcm7xx_timer/tim[%d]/timer[%d]/%s", tim_index(td->tim),
+        timer_index(td->timer), name);
     qtest_add_data_func(full_name, td, fn);
 }
 
-- 
2.23.0