[PATCH] tests/plugin: prevent uninitialized warning

[kuhn.chenqun]

From: Chen Qun <kuhn.chen...@huawei.com>

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

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

Reported-by: Euler Robot <euler.ro...@huawei.com>
Signed-off-by: Chen Qun <kuhn.chen...@huawei.com>
---
 tests/plugin/bb.c   | 2 +-
 tests/plugin/insn.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/plugin/bb.c b/tests/plugin/bb.c
index f30bea08dc..8b9da23a04 100644
--- a/tests/plugin/bb.c
+++ b/tests/plugin/bb.c
@@ -22,7 +22,7 @@ static bool do_inline;
 
 static void plugin_exit(qemu_plugin_id_t id, void *p)
 {
-    g_autofree gchar *out;
+    g_autofree gchar *out = NULL;
     out = g_strdup_printf("bb's: %" PRIu64", insns: %" PRIu64 "\n",
                           bb_count, insn_count);
     qemu_plugin_outs(out);
diff --git a/tests/plugin/insn.c b/tests/plugin/insn.c
index 0a8f5a0000..c83b1c0157 100644
--- a/tests/plugin/insn.c
+++ b/tests/plugin/insn.c
@@ -44,7 +44,7 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct 
qemu_plugin_tb *tb)
 
 static void plugin_exit(qemu_plugin_id_t id, void *p)
 {
-    g_autofree gchar *out;
+    g_autofree gchar *out = NULL;
     out = g_strdup_printf("insns: %" PRIu64 "\n", insn_count);
     qemu_plugin_outs(out);
 }
-- 
2.23.0