s390/cpumf: remove superfluous nr_cpumask_bits check

Paul Burton reported that the nr_cpumask_bits check
within cpumsf_pmu_event_init() is not necessary.

Actually there is already a prior check within
perf_event_alloc(). Therefore remove the check.
Reported-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/perf_cpum_sf.c

@@ -823,12 +823,8 @@ static int cpumsf_pmu_event_init(struct perf_event *event)
 	}
 
 	/* Check online status of the CPU to which the event is pinned */
-	if (event->cpu >= 0) {
-		if ((unsigned int)event->cpu >= nr_cpumask_bits)
+	if (event->cpu >= 0 && !cpu_online(event->cpu))
 			return -ENODEV;
-		if (!cpu_online(event->cpu))
-			return -ENODEV;
-	}
 
 	/* Force reset of idle/hv excludes regardless of what the
 	 * user requested.