strbuf: add strbuf_tolower function

diff --git a/diff-no-index.c b/diff-no-index.c
index c554691df0bdb46eee26b4ca4c957fa86fc9f8c4..265709ba8c51a4390fad11c7d1aa23551a4fd266 100644 (file)
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -198,7 +198,7 @@ void diff_no_index(struct rev_info *revs,
                        i++;
                else {
                        j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
-                       if (!j)
+                       if (j <= 0)
                                die("invalid diff option/value: %s", argv[i]);
                        i += j;
                }