drm/virtio: fix a file name comment reference

Easier to find where declarations are implemented.
Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20201119010809.528-2-gurchetansingh@chromium.orgSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -257,7 +257,7 @@ struct virtio_gpu_fpriv {
 	struct mutex context_lock;
 };
 
-/* virtio_ioctl.c */
+/* virtgpu_ioctl.c */
 #define DRM_VIRTIO_NUM_IOCTLS 11
 extern struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS];
 void virtio_gpu_create_context(struct drm_device *dev, struct drm_file *file);