hwupload: release hwconv resources on uninit
hwupload: release hwconv resources on uninit

This was forgotten in dec16e3952c14a0d1861de0af31d2b6627755791 and
5dd9ed9e7e61b0fdaa891cb8f93516ff68853b81.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl