[tip:perf/core] perf trace: Fix an exit code of trace__symbols_init

[tip-bot for Andrei Vagin]

Commit-ID:  35c33633abc14b906e84b7b0115ede6df6830120
Gitweb:     https://git.kernel.org/tip/35c33633abc14b906e84b7b0115ede6df6830120
Author:     Andrei Vagin <avagin@xxxxxxxxxx>
AuthorDate: Tue, 7 Nov 2017 16:22:46 -0800
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 28 Nov 2017 14:20:15 -0300

perf trace: Fix an exit code of trace__symbols_init

Currently if trace_event__register_resolver() fails, we return -errno,
but we can't be sure that errno isn't zero in this case.

Signed-off-by: Andrei Vagin <avagin@xxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Vasily Averin <vvs@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20171108002246.8924-2-avagin@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-trace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index f2757d3..84debdb 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1152,12 +1152,14 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 	if (trace->host == NULL)
 		return -ENOMEM;
 
-	if (trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr) < 0)
-		return -errno;
+	err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
+	if (err < 0)
+		goto out;
 
 	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
 					    evlist->threads, trace__tool_process, false,
 					    trace->opts.proc_map_timeout, 1);
+out:
 	if (err)
 		symbol__exit();