serial: pch: Fix PCI device refcount leak in pchrequestdma()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.86 by commit 6f7d82380fbeaed3a940efc33c23f0c4bbd0fc02, it was introduced in version v2.6.38 by commit 3c6a483275f47a2ef7119309ad3d791c10cf30da. For more details please see the references link.