CVE-2025-38668 regulator: core: fix NULL dereference on unbind due to stale coupling data

In the Linux kernel, the following vulnerability has been resolved: regulator: core: fix NULL dereference on unbind due to stale coupling data Failing to reset couplingdesc.ncoupled after freeing coupledrdevs can lead to NULL pointer dereference when regulators are accessed post-unbind. This can...