drm/i915: Use designated initializers for init/exit table

The kernel builds with -Werror=designated-init, and __designated_init
is used by CONFIG_GCC_PLUGIN_RANDSTRUCT for automatically selected (all
function pointer) structures. Include the field names in the init/exit
table. Avoids warnings like:

drivers/gpu/drm/i915/i915_module.c:59:4: error: positional initialization of field in 'struct' declared with 'designated_init' attribute [-Werror=designated-init]

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Fixes: a04ea6ae ("drm/i915: Use a table for i915_init/exit (v2)")
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210817233357.2379455-1-keescook@chromium.org

drivers/gpu/drm/i915/i915_module.c

@@ -47,19 +47,30 @@ static const struct {
    int (*init)(void);
    void (*exit)(void);
 } init_funcs[] = {
-	{ i915_check_nomodeset, NULL },
-	{ i915_active_module_init, i915_active_module_exit },
-	{ i915_buddy_module_init, i915_buddy_module_exit },
-	{ i915_context_module_init, i915_context_module_exit },
-	{ i915_gem_context_module_init, i915_gem_context_module_exit },
-	{ i915_objects_module_init, i915_objects_module_exit },
-	{ i915_request_module_init, i915_request_module_exit },
-	{ i915_scheduler_module_init, i915_scheduler_module_exit },
-	{ i915_vma_module_init, i915_vma_module_exit },
-	{ i915_mock_selftests, NULL },
-	{ i915_pmu_init, i915_pmu_exit },
-	{ i915_register_pci_driver, i915_unregister_pci_driver },
-	{ i915_perf_sysctl_register, i915_perf_sysctl_unregister },
+	{ .init = i915_check_nomodeset },
+	{ .init = i915_active_module_init,
+	  .exit = i915_active_module_exit },
+	{ .init = i915_buddy_module_init,
+	  .exit = i915_buddy_module_exit },
+	{ .init = i915_context_module_init,
+	  .exit = i915_context_module_exit },
+	{ .init = i915_gem_context_module_init,
+	  .exit = i915_gem_context_module_exit },
+	{ .init = i915_objects_module_init,
+	  .exit = i915_objects_module_exit },
+	{ .init = i915_request_module_init,
+	  .exit = i915_request_module_exit },
+	{ .init = i915_scheduler_module_init,
+	  .exit = i915_scheduler_module_exit },
+	{ .init = i915_vma_module_init,
+	  .exit = i915_vma_module_exit },
+	{ .init = i915_mock_selftests },
+	{ .init = i915_pmu_init,
+	  .exit = i915_pmu_exit },
+	{ .init = i915_register_pci_driver,
+	  .exit = i915_unregister_pci_driver },
+	{ .init = i915_perf_sysctl_register,
+	  .exit = i915_perf_sysctl_unregister },
 };
 static int init_progress;