initctl: fix use of possibly unterminated string, found by Coverity

No point in using rq.data, which could have been modified, instead use
the input argument to the function in the error message.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/initctl.c

@@ -208,7 +208,7 @@ static int do_startstop(int cmd, char *arg)
 
 	strlcpy(rq.data, arg, sizeof(rq.data));
 	if (client_send(&rq, sizeof(rq))) {
-		fprintf(stderr, "No such task or service(s): %s\n\n", rq.data);
+		fprintf(stderr, "No such task or service(s): %s\n\n", arg);
 		fprintf(stderr, "Usage: initctl %s <NAME>[:ID]\n",
 			cmd == INIT_CMD_START_SVC ? "start" :
 			(cmd == INIT_CMD_STOP_SVC ? "stop"  : "restart"));