tcg: Avoid using hardcoded /tmp

Use g_get_tmp_dir() to get the directory to use for temporary files.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221006151927.2079583-3-bmeng.cn@gmail.com>
Message-Id: <20221027183637.2772968-12-alex.bennee@linaro.org>

tcg/tcg.c

@@ -4729,7 +4729,8 @@ static void tcg_register_jit_int(const void *buf_ptr, size_t buf_size,
     /* Enable this block to be able to debug the ELF image file creation.
        One can use readelf, objdump, or other inspection utilities.  */
     {
-        FILE *f = fopen("/tmp/qemu.jit", "w+b");
+        g_autofree char *jit = g_strdup_printf("%s/qemu.jit", g_get_tmp_dir());
+        FILE *f = fopen(jit, "w+b");
         if (f) {
             if (fwrite(img, img_size, 1, f) != img_size) {
                 /* Avoid stupid unused return value warning for fwrite.  */