perf, x86: Report error code that returned from x86_pmu.hw_config()

If x86_pmu.hw_config() fails a fixed error code (-EOPNOTSUPP) is
returned even if a different error was reported. This patch fixes
this.

Signed-off-by: Robert Richter <robert.richter@amd.com>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Acked-by: Lin Ming <ming.m.lin@intel.com>
Cc: acme@redhat.com
Cc: eranian@google.com
Cc: gorcunov@openvz.org
Cc: peterz@infradead.org
Cc: fweisbec@gmail.com
LKML-Reference: <20100316160733.GR1585@erda.amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_event.c

@@ -472,8 +472,9 @@ static int __hw_perf_event_init(struct perf_event *event)
 	hwc->last_tag = ~0ULL;
 
 	/* Processor specifics */
-	if (x86_pmu.hw_config(attr, hwc))
-		return -EOPNOTSUPP;
+	err = x86_pmu.hw_config(attr, hwc);
+	if (err)
+		return err;
 
 	if (!hwc->sample_period) {
 		hwc->sample_period = x86_pmu.max_period;