panfrost: Ensure compute shader_meta is zeroed

In theory the hardware doesn't care but it'll make for easier traces.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3835>

src/gallium/drivers/panfrost/pan_compute.c

@@ -52,7 +52,8 @@ panfrost_create_compute_state(
         so->variant_count = 1;
         so->active_variant = 0;
 
-        v->tripipe = malloc(sizeof(struct mali_shader_meta));
+        /* calloc, instead of malloc - to zero unused fields */
+        v->tripipe = CALLOC_STRUCT(mali_shader_meta);
 
         if (cso->ir_type == PIPE_SHADER_IR_NIR_SERIALIZED) {
                 struct blob_reader reader;