perf/x86/uncore: Fix potential NULL pointer in uncore_get_alias_name
The current code assumes that the discovery table provides valid box_ids for the normal units. It's not the case anymore since some units in the discovery table are broken on some SPR variants. Factor out uncore_get_box_id(). Check the existence of the type->box_ids before using it. If it's not available, use pmu_idx. Signed-off-by: NKan Liang <kan.liang@linux.intel.com> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Tested-by: NMichael Petlan <mpetlan@redhat.com> Link: https://lore.kernel.org/r/20230112200105.733466-3-kan.liang@linux.intel.com
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