TT#111150 Use {} instead of ; to mark an empty body

Change-Id: Ib87db24dbb0d89cb03052e7b8a2e8d8802246c33
Warned-by: gcc -Wempty-body

daemon/control_tcp.c

@@ -102,7 +102,7 @@ static int control_stream_parse(struct streambuf_stream *s, char *line) {
 	else if (!strcmp(out[RE_TCP_DIV_CMD], "controls"))
 		control_list(c, s);
 	else if (!strcmp(out[RE_TCP_DIV_CMD], "quit") || !strcmp(out[RE_TCP_DIV_CMD], "exit"))
-		;
+		{}
 
 	if (output) {
 		streambuf_write_str(s->outbuf, output);

daemon/dtls.c

@@ -729,7 +729,7 @@ int dtls(struct stream_fd *sfd, const str *s, const endpoint_t *fsin) {
 		/* connected! */
 		mutex_lock(&ps->out_lock); // nested lock!
 		if (dtls_setup_crypto(ps, d))
-			/* XXX ?? */ ;
+			{} /* XXX ?? */
 		mutex_unlock(&ps->out_lock);
 
 		if (PS_ISSET(ps, RTP) && PS_ISSET(ps, RTCP) && ps->rtcp_sibling
@@ -740,7 +740,7 @@ int dtls(struct stream_fd *sfd, const str *s, const endpoint_t *fsin) {
 			mutex_lock(&ps->rtcp_sibling->in_lock);
 			mutex_lock(&ps->rtcp_sibling->out_lock);
 			if (dtls_setup_crypto(ps->rtcp_sibling, d))
-				/* XXX ?? */ ;
+				{} /* XXX ?? */
 			mutex_unlock(&ps->rtcp_sibling->out_lock);
 			mutex_unlock(&ps->rtcp_sibling->in_lock);
 		}

daemon/media_socket.c

@@ -1525,8 +1525,9 @@ static int media_demux_protocols(struct packet_handler_ctx *phc) {
 			call_media_state_machine(phc->mp.media);
 			return 1;
 		}
-		else /* not an stun packet */
-			;
+		else {
+			/* not an stun packet */
+		}
 	}
 	return -1;
 }