zram: destroy all devices on error recovery path in zram_init()

(cherry pick from commit 39a9b8ac9333e4268ecff7da6c9d1ab3823ff243)

On error recovery path of zram_init(), it leaks the zram device object
causing the failure. So change create_device() to free allocated
resources on error path.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 24810447
Change-Id: Ifb794f34d4e999ebd35b89aa2f3eeca8fd696ce8