log: Do not decorate replacements with --no-replace-objects

5267d29 (log: decorate "replaced" on to replaced commits, 2011-08-19)
introduced textual decorations for replaced commits, based on the
detection of refs/replace.

Make it so that additionally the use of --no-replace-objects is
detected: I.e. replaced commits are only decorated as replaced when they
are actually replaced.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

log-tree.c

@@ -97,6 +97,8 @@ static int add_ref_decoration(const char *refname, const unsigned char *sha1, in
 
 	if (!prefixcmp(refname, "refs/replace/")) {
 		unsigned char original_sha1[20];
+		if (!read_replace_refs)
+			return 0;
 		if (get_sha1_hex(refname + 13, original_sha1)) {
 			warning("invalid replace ref %s", refname);
 			return 0;