s390/perf: Change CPUM_CF return code in event init function

The function perf_init_event() creates a new event and
assignes it to a PMU. This a done in a loop over all existing
PMUs. For each listed PMU the event init function is called
and if this function does return any other error than -ENOENT,
the loop is terminated the creation of the event fails.

If the event is invalid, return -ENOENT to try other PMUs.

Signed-off-by: Thomas Richter <[e-mail]>
Reviewed-by: Hendrik Brueckner <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

arch/s390/kernel/perf_cpum_cf.c

···
 		return -ENOENT;
 
 	if (ev > PERF_CPUM_CF_MAX_CTR)
-		return -EINVAL;
+		return -ENOENT;
 
 	/* Obtain the counter set to which the specified counter belongs */
 	set = get_counter_set(ev);