aco/tests: initialize debug function

aco_log() will print the message to stderr.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7045>

src/amd/compiler/tests/helpers.cpp

@@ -82,6 +82,9 @@ void create_program(enum chip_class chip_class, Stage stage, unsigned wave_size,
    program.reset(new Program);
    aco::init_program(program.get(), stage, &info, chip_class, family, &config);
 
+   program->debug.func = nullptr;
+   program->debug.private_data = nullptr;
+
    Block *block = program->create_and_insert_block();
    block->kind = block_kind_top_level;