ACPI: CPPC: Add NULL pointer check to cppc_get_perf()
Check cpc_desc against NULL in cppc_get_perf(), so it doesn't crash down the road if cpc_desc is NULL. Fixes: 0654cf05 ("ACPI: CPPC: Introduce cppc_get_nominal_perf()") Reported-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: 5.15+ <stable@vger.kernel.org> # 5.15+ Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
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