Print out the signal number on exit in terminate(..) if WARMSTART is compiled

into rpcbind.

The signal number can provide helpful diagnostic info.

MFC after:	1 week
Obtained from:	Isilon OneFS
Sponsored by:	Dell EMC Isilon

usr.sbin/rpcbind/rpcbind.c

@@ -757,12 +757,13 @@ rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf,
  * Catch the signal and die
  */
 static void
-terminate(int dummy __unused)
+terminate(int signum __unused)
 {
 	close(rpcbindlockfd);
 #ifdef WARMSTART
 	syslog(LOG_ERR,
-		"rpcbind terminating on signal. Restart with \"rpcbind -w\"");
+	    "rpcbind terminating on signal %d. Restart with \"rpcbind -w\"",
+	    signum);
 	write_warmstart();	/* Dump yourself */
 #endif
 	exit(2);