[glib/wip/pwithnall/restore-macos-ci] tests: Silence set-but-not-used warnings for variables in autoptr test

[Philip Withnall <pwithnall src gnome org>]

commit 8342b7d0df39dd771cf1e103e39de10f4f898d7e
Author: Philip Withnall <pwithnall endlessos org>
Date:   Fri May 27 15:39:38 2022 +0100

    tests: Silence set-but-not-used warnings for variables in autoptr test
    
    Clang decides that `p` and `p2` are set but not used. Try a bit harder
    to trick it.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 glib/tests/autoptr.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/glib/tests/autoptr.c b/glib/tests/autoptr.c
index 59471d02f4..1b2dd7b094 100644
--- a/glib/tests/autoptr.c
+++ b/glib/tests/autoptr.c
@@ -20,6 +20,9 @@ test_autofree (void)
   p = g_malloc (10);
   p2 = g_malloc (42);
 
+  p[0] = 1;
+  p2[0] = 1;
+
   if (TRUE)
     {
       g_autofree guint8 *buf = g_malloc (128);