soc: qcom: aoss: Fix refcount leak in qmp_cooling_devices_register

In the Linux kernel, the following vulnerability has been resolved:

soc: qcom: aoss: Fix refcount leak in qmp_cooling_devices_register

Every iteration of for_each_available_child_of_node() decrements

the reference count of the previous node.

When breaking early from a for_each_available_child_of_node() loop,

we need to explicitly call of_node_put() on the child node.

Add missing of_node_put() to avoid refcount leak.