lib: Clear kernel output buffers for valgrind

Clear a couple of output buffers written to by the kernel so that
valgrind is not confused.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/sw_sync.c b/lib/sw_sync.c
index b6f70b3c..6c762c8b 100644
--- a/lib/sw_sync.c
+++ b/lib/sw_sync.c
@@ -183,7 +183,7 @@ int sync_fence_count(int fd)
 
 uint64_t sync_fence_timestamp(int fd)
 {
-	struct sync_fence_info fence;
+	struct sync_fence_info fence = {};
 	struct sync_file_info info = {
 		.sync_fence_info = to_user_pointer(&fence),
 		.num_fences = 1,
@@ -195,6 +195,7 @@ uint64_t sync_fence_timestamp(int fd)
 	if (info.num_fences > 1)
 		return 0;
 
+	igt_assert(fence.timestamp_ns);
 	return fence.timestamp_ns;
 }