[PATCH v2 3/5] diff --color-moved-ws: fix a memory leak

[Phillip Wood]

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

Notes:
    Changes since v1:
     - simplified code as suggested by Martin Ågren

 diff.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/diff.c b/diff.c
index e492f8b74f..9bf41bad0d 100644
--- a/diff.c
+++ b/diff.c
@@ -786,10 +786,13 @@ static int compute_ws_delta(const struct 
emitted_diff_symbol *a,
        const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
        int d = longer->len - shorter->len;
 
+       if (strncmp(longer->line + d, shorter->line, shorter->len))
+               return 0;
+
        out->string = xmemdupz(longer->line, d);
        out->current_longer = (a == longer);
 
-       return !strncmp(longer->line + d, shorter->line, shorter->len);
+       return 1;
 }
 
 static int cmp_in_block_with_wsd(const struct diff_options *o,
-- 
2.19.0