tests/unit: simpler variable sequence for test-io-channel

This avoids some compilers complaining about a potentially
un-initialised [src|dst]argv. In retrospect using GString was overkill
for what we are constructing.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20221103102329.2581508-1-alex.bennee@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

tests/unit/test-io-channel-command.c

@@ -33,19 +33,13 @@ static void test_io_channel_command_fifo(bool async)
 {
     g_autofree gchar *tmpdir = g_dir_make_tmp("qemu-test-io-channel.XXXXXX", NULL);
     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_autofree gchar *srcargs = g_strdup_printf("%s - PIPE:%s,wronly", socat, fifo);
+    g_autofree gchar *dstargs = g_strdup_printf("%s PIPE:%s,rdonly -", socat, fifo);
+    g_auto(GStrv) srcargv = g_strsplit(srcargs, " ", -1);
+    g_auto(GStrv) dstargv = g_strsplit(dstargs, " ", -1);
     QIOChannel *src, *dst;
     QIOChannelTest *test;
 
-    g_string_append_printf(srcargs, " - PIPE:%s,wronly", fifo);
-    g_string_append_printf(dstargs, " PIPE:%s,rdonly -", fifo);
-
-    srcargv = g_strsplit(srcargs->str, " ", -1);
-    dstargv = g_strsplit(dstargs->str, " ", -1);
-
     src = QIO_CHANNEL(qio_channel_command_new_spawn((const char **) srcargv,
                                                     O_WRONLY,
                                                     &error_abort));