use skip_prefix to avoid magic numbers

diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 72378e6810a33b8d0e0285b14babc57b39287bb9..3c19241554da225423fb1f10eaaebb56db7e73fd 100644 (file)
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -297,7 +297,7 @@ static void credit_people(struct strbuf *out,
        if (!them->nr ||
            (them->nr == 1 &&
             me &&
-            (me = skip_prefix(me, them->items->string)) != NULL &&
+            skip_prefix(me, them->items->string, &me) &&
             starts_with(me, " <")))
                return;
        strbuf_addf(out, "\n%c %s ", comment_line_char, label);