fb: remove unused buffer

it8951_fb.c

@@ -155,11 +155,6 @@ int it8951_fb_register(struct rect screen_geom, struct it8951_ops ops, struct de
 		status = -ENOMEM;
 		goto err;
 	}
-	data->buf = (uint8_t *)vzalloc(fb_size);
-	if (!data->buf) {
-		status = -ENOMEM;
-		goto err_buf;
-	}
 	fb_info->fbops = &it8951_fb_ops;
 	fb_info->var = fb_var;
 	fb_info->var.xres = DEFAULT_DPY_W;
@@ -221,8 +216,6 @@ err_register:
 err_cmap:
 	fb_dealloc_cmap(&fb_info->cmap);
 err_fb:
-	vfree(data->buf);
-err_buf:
 	vfree(fb_info->screen_base);
 err:
 	framebuffer_release(fb_info);
@@ -235,7 +228,6 @@ int it8951_fb_unregister(struct it8951_fb_data *data) {
 	unregister_framebuffer(fb_info);
 	drain_workqueue(data->wq);
 	fb_dealloc_cmap(&fb_info->cmap);
-	vfree(data->buf);
 	vfree(fb_info->screen_base);
 	framebuffer_release(fb_info);
 	return 0;

it8951_fb.h

@@ -81,7 +81,6 @@ struct it8951_fb_data {
 	atomic64_t              last_update;
 	struct it8951_ops       ops;
 	struct device           *dev;
-	uint8_t                 *buf;
 };
 
 int it8951_fb_register(struct rect screen_geom, struct it8951_ops ops, struct device *dev, struct it8951_fb_data **fb_drvp);