[PATCH] tests/unit/test-io-channel-command: Silence GCC error "maybe-uninitialized"

[Bernhard Beschow <shentey@gmail.com>]

GCC issues a false positive warning, resulting in build failure with -Werror:

  In file included from /usr/lib/glib-2.0/include/glibconfig.h:9,
                   from /usr/include/glib-2.0/glib/gtypes.h:34,
                   from /usr/include/glib-2.0/glib/galloca.h:34,
                   from /usr/include/glib-2.0/glib.h:32,
                   from ../src/include/glib-compat.h:32,
                   from ../src/include/qemu/osdep.h:144,
                   from ../src/tests/unit/test-io-channel-command.c:21:
  /usr/include/glib-2.0/glib/gmacros.h: In function ‘test_io_channel_command_fifo’:
  /usr/include/glib-2.0/glib/gmacros.h:1333:105: error: ‘dstargv’ may be used uninitialized [-Werror=maybe-uninitialized]
   1333 |   static G_GNUC_UNUSED inline void _GLIB_AUTO_FUNC_NAME(TypeName) (TypeName *_ptr) { if (*_ptr != none) (func) (*_ptr); }     \
        |                                                                                                         ^
  ../src/tests/unit/test-io-channel-command.c:39:19: note: ‘dstargv’ was declared here
     39 |     g_auto(GStrv) dstargv;
        |                   ^~~~~~~
  /usr/include/glib-2.0/glib/gmacros.h:1333:105: error: ‘srcargv’ may be used uninitialized [-Werror=maybe-uninitialized]
   1333 |   static G_GNUC_UNUSED inline void _GLIB_AUTO_FUNC_NAME(TypeName) (TypeName *_ptr) { if (*_ptr != none) (func) (*_ptr); }     \
        |                                                                                                         ^
  ../src/tests/unit/test-io-channel-command.c:38:19: note: ‘srcargv’ was declared here
     38 |     g_auto(GStrv) srcargv;
        |                   ^~~~~~~
  cc1: all warnings being treated as errors

GCC version:

  $ gcc --version
  gcc (GCC) 12.2.0

Fixes: 68406d10859385c88da73d0106254a7f47e6652e ('tests/unit: cleanups for test-io-channel-command')
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 tests/unit/test-io-channel-command.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/unit/test-io-channel-command.c b/tests/unit/test-io-channel-command.c
index 43e29c8cfb..ba0717d3c3 100644
--- a/tests/unit/test-io-channel-command.c
+++ b/tests/unit/test-io-channel-command.c
@@ -35,8 +35,8 @@ static void test_io_channel_command_fifo(bool async)
     g_autofree gchar *fifo = g_strdup_printf("%s/%s", tmpdir, TEST_FIFO);
     g_autoptr(GString) srcargs = g_string_new(socat);
     g_autoptr(GString) dstargs = g_string_new(socat);
-    g_auto(GStrv) srcargv;
-    g_auto(GStrv) dstargv;
+    g_auto(GStrv) srcargv = NULL;
+    g_auto(GStrv) dstargv = NULL;
     QIOChannel *src, *dst;
     QIOChannelTest *test;
 
-- 
2.38.1