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-rw-r--r--diff-lib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/diff-lib.c b/diff-lib.c
index 2edea41a23..dec040c366 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -673,7 +673,7 @@ int index_differs_from(struct repository *r,
return (has_changes != 0);
}
-static struct strbuf *idiff_prefix_cb(struct diff_options *opt, void *data)
+static struct strbuf *idiff_prefix_cb(struct diff_options *opt UNUSED, void *data)
{
return data;
}