t4201: make use of abbreviation in the test more robust

diff --git a/builtin/diff.c b/builtin/diff.c
index 7f91f6d2267db962fb7c25e92983afd4e811d43e..3d64b8533732b5d4af971e6b1cd23ff66123e8e9 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -45,12 +45,9 @@ static void stuff_change(struct diff_options *opt,
                return;
 
        if (DIFF_OPT_TST(opt, REVERSE_DIFF)) {
-               unsigned tmp;
-               const unsigned char *tmp_u;
-               const char *tmp_c;
-               tmp = old_mode; old_mode = new_mode; new_mode = tmp;
-               tmp_u = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_u;
-               tmp_c = old_name; old_name = new_name; new_name = tmp_c;
+               SWAP(old_mode, new_mode);
+               SWAP(old_sha1, new_sha1);
+               SWAP(old_name, new_name);
        }
 
        if (opt->prefix &&