for_each_reflog_ent: be forgiving about missing message

Some reflogs are/were generated without a message; do not plainly
ignore those entries.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

refs.c

@@ -1192,12 +1192,14 @@ int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
 		    !message || message[0] != ' ' ||
 		    (message[1] != '+' && message[1] != '-') ||
 		    !isdigit(message[2]) || !isdigit(message[3]) ||
-		    !isdigit(message[4]) || !isdigit(message[5]) ||
-		    message[6] != '\t')
+		    !isdigit(message[4]) || !isdigit(message[5]))
 			continue; /* corrupt? */
 		email_end[1] = '\0';
 		tz = strtol(message + 1, NULL, 10);
-		message += 7;
+		if (message[6] != '\t')
+			message += 6;
+		else
+			message += 7;
 		ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
 		if (ret)
 			break;