md: Don't set mddev private to NULL in raid0 pers->free
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 v5.18.3 by commit 7da3454a65f8a56e65dfb44fa0ccac08cbc2f5a1, it was introduced in version v5.17 by commit 0c031fd37f69deb0cd8c43bbfcfccd62ebd7e952. For more details please see the references link.