[PATCH] perf record: Fix s390 random record__auxtrace_init return value

[Thomas Richter]

Command perf record calls
cmd_report
+---> record__auxtrace_init
      +---> auxtrace_record__init()

On s390 function auxtrace_record__init() returns random return
value due to missing initialization.
This sometime causes perf record to exit immediately without
error message and creating a perf.data file.

Fix this by setting error return code to zero before return
from platform specific function which does not set the
error code in call cases.

Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
---
 tools/perf/arch/s390/util/auxtrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/arch/s390/util/auxtrace.c b/tools/perf/arch/s390/util/auxtrace.c
index 6cb48e4cffd9..3afe8256eff2 100644
--- a/tools/perf/arch/s390/util/auxtrace.c
+++ b/tools/perf/arch/s390/util/auxtrace.c
@@ -87,6 +87,7 @@ struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
 	struct perf_evsel *pos;
 	int diagnose = 0;
 
+	*err = 0;
 	if (evlist->nr_entries == 0)
 		return NULL;
 
-- 
2.14.3