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-rw-r--r--third_party/git/diff-delta.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/third_party/git/diff-delta.c b/third_party/git/diff-delta.c
index e49643353bf5..77fea08dfb04 100644
--- a/third_party/git/diff-delta.c
+++ b/third_party/git/diff-delta.c
@@ -326,6 +326,8 @@ create_delta(const struct delta_index *index,
 	const unsigned char *ref_data, *ref_top, *data, *top;
 	unsigned char *out;
 
+	*delta_size = 0;
+
 	if (!trg_buf || !trg_size)
 		return NULL;