minor, improve main loop

main.c

@@ -413,10 +413,12 @@ void main(void)
 				}
 			}
 			nec_flag = false; // clear flag
+			action = true; // redo loop
 		}
 		if (0 == time_count % (488UL * SHARE_TIME)) {
 			nec_transmit(0xfb047f80);
 			putc('t');
+			action = true; // redo main loop
 		}
 		if (time_count > 488UL * REST_TIME) {
 			puts("rest\r\n");