drivers/perf: arm_pmu_platform: do not warn about affinity on uniprocessor

If there is exactly one CPU present, there is no ambiguity: do not warn
that PMU setup would need to guess IRQ affinity.

Cc: Mark Rutland <[e-mail]>
Cc: Will Deacon <[e-mail]>
Signed-off-by: Alexander Monakov <[e-mail]>
Signed-off-by: Will Deacon <[e-mail]>

drivers/perf/arm_pmu_platform.c

···
 			return pmu_parse_percpu_irq(pmu, irq);
 	}
 
-	if (!pmu_has_irq_affinity(pdev->dev.of_node)) {
+	if (nr_cpu_ids != 1 && !pmu_has_irq_affinity(pdev->dev.of_node)) {
 		pr_warn("no interrupt-affinity property for %pOF, guessing.\n",
 			pdev->dev.of_node);
 	}