drm/virtio: simplify virtio_gpu_alloc_cmd

Just call virtio_gpu_alloc_cmd_resp with some fixed args
instead of duplicating most of the function body.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200207074638.26386-2-kraxel@redhat.comReviewed-by: Chia-I Wu <olvaffe@gmail.com>

drivers/gpu/drm/virtio/virtgpu_vq.c

@@ -120,23 +120,6 @@ virtio_gpu_vbuf_ctrl_hdr(struct virtio_gpu_vbuffer *vbuf)
 	return (struct virtio_gpu_ctrl_hdr *)vbuf->buf;
 }
 
-static void *virtio_gpu_alloc_cmd(struct virtio_gpu_device *vgdev,
-				  struct virtio_gpu_vbuffer **vbuffer_p,
-				  int size)
-{
-	struct virtio_gpu_vbuffer *vbuf;
-
-	vbuf = virtio_gpu_get_vbuf(vgdev, size,
-				   sizeof(struct virtio_gpu_ctrl_hdr),
-				   NULL, NULL);
-	if (IS_ERR(vbuf)) {
-		*vbuffer_p = NULL;
-		return ERR_CAST(vbuf);
-	}
-	*vbuffer_p = vbuf;
-	return vbuf->buf;
-}
-
 static struct virtio_gpu_update_cursor*
 virtio_gpu_alloc_cursor(struct virtio_gpu_device *vgdev,
 			struct virtio_gpu_vbuffer **vbuffer_p)
@@ -172,6 +155,15 @@ static void *virtio_gpu_alloc_cmd_resp(struct virtio_gpu_device *vgdev,
 	return (struct virtio_gpu_command *)vbuf->buf;
 }
 
+static void *virtio_gpu_alloc_cmd(struct virtio_gpu_device *vgdev,
+				  struct virtio_gpu_vbuffer **vbuffer_p,
+				  int size)
+{
+	return virtio_gpu_alloc_cmd_resp(vgdev, NULL, vbuffer_p, size,
+					 sizeof(struct virtio_gpu_ctrl_hdr),
+					 NULL);
+}
+
 static void free_vbuf(struct virtio_gpu_device *vgdev,
 		      struct virtio_gpu_vbuffer *vbuf)
 {