[PATCHv2 1/2] perf data: Show error message when conversion failed

[He Kuang]

Show message when errors occurred during conversion setup and conversion
process.

Before this patch:
  $ ./perf data convert --to-ctf=ctf
  $ echo $?
  255

After this patch:
  $ ./perf data convert --to-ctf=ctf
  Error during conversion setup.

Signed-off-by: He Kuang <hekuang@xxxxxxxxxx>
---
 tools/perf/util/data-convert-bt.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
index 7a12047..de80ded 100644
--- a/tools/perf/util/data-convert-bt.c
+++ b/tools/perf/util/data-convert-bt.c
@@ -896,6 +896,8 @@ int bt_convert__perf2ctf(const char *input, const char *path, bool force)
 	err = perf_session__process_events(session);
 	if (!err)
 		err = bt_ctf_stream_flush(cw->stream);
+	else
+		pr_err("Error during conversion.\n");
 
 	fprintf(stderr,
 		"[ perf data convert: Converted '%s' into CTF data '%s' ]\n",
@@ -906,11 +908,15 @@ int bt_convert__perf2ctf(const char *input, const char *path, bool force)
 		(double) c.events_size / 1024.0 / 1024.0,
 		c.events_count);
 
-	/* its all good */
-free_session:
 	perf_session__delete(session);
+	ctf_writer__cleanup(cw);
 
+	return err;
+
+free_session:
+	perf_session__delete(session);
 free_writer:
 	ctf_writer__cleanup(cw);
+	pr_err("Error during conversion setup.\n");
 	return err;
 }
-- 
2.3.3.220.g9ab698f

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