gpu/drm/virtio/virtgpu_vq.c: Use kmem_cache_zalloc

Replaced kmem_cache_alloc + memset with kmem_cache_zalloc
Signed-off-by: NSabyasachi Gupta <sabyasachi.linux@gmail.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/5bc9ff7e.1c69fb81.105c2.1fef@mx.google.comSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_vq.c

@@ -78,10 +78,9 @@ virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev,
 {
 	struct virtio_gpu_vbuffer *vbuf;
 
-	vbuf = kmem_cache_alloc(vgdev->vbufs, GFP_KERNEL);
+	vbuf = kmem_cache_zalloc(vgdev->vbufs, GFP_KERNEL);
 	if (!vbuf)
 		return ERR_PTR(-ENOMEM);
-	memset(vbuf, 0, VBUFFER_SIZE);
 
 	BUG_ON(size > MAX_INLINE_CMD_SIZE);
 	vbuf->buf = (void *)vbuf + sizeof(*vbuf);