fix warning #1295-D Deprecated declaration

components/drivers/include/drivers/rtc.h

@@ -71,7 +71,7 @@ rt_err_t set_timestamp(time_t timestamp);
 rt_err_t get_timestamp(time_t *timestamp);
 
 #ifdef RT_USING_SYSTEM_WORKQUEUE
-rt_err_t rt_soft_rtc_sync();
+rt_err_t rt_soft_rtc_sync(void);
 rt_err_t rt_soft_rtc_set_source(const char *name);
 #endif
 

components/drivers/rtc/soft_rtc.c

@@ -268,7 +268,7 @@ INIT_DEVICE_EXPORT(rt_soft_rtc_init);
 
 #ifdef RT_USING_SYSTEM_WORKQUEUE
 
-rt_err_t rt_soft_rtc_sync()
+rt_err_t rt_soft_rtc_sync(void)
 {
     time_t time = 0;