[PATCH][next] drm/selftests/test-drm_dp_mst_helper: fix memory leak allocated to 'out'

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

Currently when txmsg fails to allocate then there is a leak on 'out'. Fix
this by setting result to false and exiting via the clean up exit path.
Note since txmsg is NULL at this point, the kfree of txmsg is a no-op.

Addresses-Coverity: ("Resource leak")
Fixes: 09234b88ef55 ("drm/selftests/test-drm_dp_mst_helper: Move 'sideband_msg_req_encode_decode' onto the heap")
Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
index 6b4759ed6bfd..dbac073ed385 100644
--- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
@@ -131,8 +131,10 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 		return false;
 
 	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
-	if (!txmsg)
-		return false;
+	if (!txmsg) {
+		result = false;
+		goto out;
+	}
 
 	drm_dp_encode_sideband_req(in, txmsg);
 	ret = drm_dp_decode_sideband_req(txmsg, out);
-- 
2.28.0