w1: Add missing of_node_put() in w1.c

In __w1_attach_slave_device, we really need not to use of_node_put
in normal path as the reference is escaped by sl. However, we need
of_node_put in the fail path before put_device.

Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220615125105.3966317-1-windhl@126.com


[krzysztof: fix whitespace / checkpatch]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>