[PATCH 6.6 0/1] cpufreq: amd-pstate: add check for cpufreq_cpu_get's return value

NULL-dereference is possible in amd_pstate_adjust_perf in 6.6 stable release.

The problem has been fixed by the following upstream patch that was adapted to 6.6. The patch couldn't be applied clearly but the changes made are minor.

Found by Linux Verification Center (linuxtesting.org) with SVACE.