Add a GUARD log domain, for use with new guards code

src/common/log.c

@@ -1177,7 +1177,7 @@ static const char *domain_list[] = {
   "GENERAL", "CRYPTO", "NET", "CONFIG", "FS", "PROTOCOL", "MM",
   "HTTP", "APP", "CONTROL", "CIRC", "REND", "BUG", "DIR", "DIRSERV",
   "OR", "EDGE", "ACCT", "HIST", "HANDSHAKE", "HEARTBEAT", "CHANNEL",
-  "SCHED", NULL
+  "SCHED", "GUARD", NULL
 };
 
 /** Return a bitmask for the log domain for which <b>domain</b> is the name,

src/common/torlog.h

@@ -99,8 +99,10 @@
 #define LD_CHANNEL   (1u<<21)
 /** Scheduler */
 #define LD_SCHED     (1u<<22)
+/** Guard nodes */
+#define LD_GUARD     (1u<<23)
 /** Number of logging domains in the code. */
-#define N_LOGGING_DOMAINS 23
+#define N_LOGGING_DOMAINS 24
 
 /** This log message is not safe to send to a callback-based logger
  * immediately.  Used as a flag, not a log domain. */