[PATCH 3/5] diff --color-moved-ws: fix a memory leak

[Phillip Wood <phillip.wood@talktalk.net>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

Don't duplicate the indentation string if we're not going to use it.
This was found with asan.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 diff.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/diff.c b/diff.c
index 0096bdc339..efadd05c90 100644
--- a/diff.c
+++ b/diff.c
@@ -785,11 +785,15 @@ static int compute_ws_delta(const struct emitted_diff_symbol *a,
 	const struct emitted_diff_symbol *longer =  a->len > b->len ? a : b;
 	const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
 	int d = longer->len - shorter->len;
+	int ret = !strncmp(longer->line + d, shorter->line, shorter->len);
+
+	if (!ret)
+		return ret;
 
 	out->string = xmemdupz(longer->line, d);
 	out->current_longer = (a == longer);
 
-	return !strncmp(longer->line + d, shorter->line, shorter->len);
+	return ret;
 }
 
 static int cmp_in_block_with_wsd(const struct diff_options *o,
-- 
2.19.0