Explain seemingly pointless use of system in difftool

diff --git a/branch.c b/branch.c
index 558f092701f7aa797a0b38a48f67fef6f0218f9c..62030af4b51abbfb9c488dbf018770f3b3606789 100644 (file)
--- a/branch.c
+++ b/branch.c
@@ -135,10 +135,7 @@ void create_branch(const char *head,
        struct strbuf ref = STRBUF_INIT;
        int forcing = 0;
 
-       strbuf_branchname(&ref, name);
-       strbuf_splice(&ref, 0, 0, "refs/heads/", 11);
-
-       if (check_ref_format(ref.buf))
+       if (strbuf_check_branch_ref(&ref, name))
                die("'%s' is not a valid branch name.", name);
 
        if (resolve_ref(ref.buf, sha1, 1, NULL)) {