slimbus: core: fix OF node leak on registration failure

slimbus: core: fix OF node leak on registration failure

Make sure to drop the OF node reference taken when initialising and
registering the slimbus device also on registration failure by releasing
it in the destructor as expected.

Fixes: 7588a511bdb4 ("slimbus: core: add support to device tree helper")
Fixes: 01360857486c ("slimbus: core: Fix mismatch in of_node_get/put")
Cc: Saravana Kannan <saravanak@google.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251126145329.5022-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>