drm: Convert drm_legacy_ctxbitmap_init to void return type

It can't fail really.

Also remove the redundant kms check Peter added.

Cc: Peter Antoine <[e-mail]>
Reviewed-by: Peter Antoine <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/drm_context.c

···
  *
  * Initialise the drm_device::ctx_idr
  */
-int drm_legacy_ctxbitmap_init(struct drm_device * dev)
+void drm_legacy_ctxbitmap_init(struct drm_device * dev)
 {
 	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 	    drm_core_check_feature(dev, DRIVER_MODESET))
-		return -EINVAL;
+		return;
 
 	idr_init(&dev->ctx_idr);
-	return 0;
 }
 
 /**

drivers/gpu/drm/drm_drv.c

···
 	if (drm_ht_create(&dev->map_hash, 12))
 		goto err_minors;
 
-	if (drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) ||
-		!drm_core_check_feature(dev, DRIVER_MODESET))
-		ret = drm_legacy_ctxbitmap_init(dev);
-		if (ret) {
-			DRM_ERROR(
-				"Cannot allocate memory for context bitmap.\n");
-			goto err_ht;
-		}
+	drm_legacy_ctxbitmap_init(dev);
 
 	if (drm_core_check_feature(dev, DRIVER_GEM)) {
 		ret = drm_gem_init(dev);
···
 
 err_ctxbitmap:
 	drm_legacy_ctxbitmap_cleanup(dev);
-err_ht:
 	drm_ht_remove(&dev->map_hash);
 err_minors:
 	drm_minor_free(dev, DRM_MINOR_LEGACY);

drivers/gpu/drm/drm_legacy.h

···
 #define DRM_KERNEL_CONTEXT		0
 #define DRM_RESERVED_CONTEXTS		1
 
-int drm_legacy_ctxbitmap_init(struct drm_device *dev);
+void drm_legacy_ctxbitmap_init(struct drm_device *dev);
 void drm_legacy_ctxbitmap_cleanup(struct drm_device *dev);
 void drm_legacy_ctxbitmap_free(struct drm_device *dev, int ctx_handle);
 void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file);