esp_hw_support/sleep: fix light sleep wakeup flag

light sleep wakeup flag is true to indicate the most recent successful wakeup from light sleep,
which means the most recent light sleep occurred successfully and then wakes up by wakeup source

components/esp_hw_support/sleep_modes.c

@@ -796,15 +796,20 @@ esp_err_t esp_light_sleep_start(void)
     int64_t final_sleep_duration_us = (int64_t)s_config.sleep_duration - (int64_t)s_config.sleep_time_adjustment;
     int64_t min_sleep_duration_us = rtc_time_slowclk_to_us(RTC_CNTL_MIN_SLP_VAL_MIN, s_config.rtc_clk_cal_period);
 
+    // reset light sleep wakeup flag before a new light sleep
+    s_light_sleep_wakeup = false;
+
     // if rtc timer wakeup source is enabled, need to compare final sleep duration and min sleep duration to avoid late wakeup
     if ((s_config.wakeup_triggers & RTC_TIMER_TRIG_EN) && (final_sleep_duration_us <= min_sleep_duration_us)) {
         err = ESP_ERR_SLEEP_TOO_SHORT_SLEEP_DURATION;
     } else {
         // Enter sleep, then wait for flash to be ready on wakeup
         err = esp_light_sleep_inner(pd_flags, flash_enable_time_us, vddsdio_config);
-        s_light_sleep_wakeup = true;
     }
 
+    // light sleep wakeup flag only makes sense after a successful light sleep
+    s_light_sleep_wakeup = (err == ESP_OK);
+
     // System timer has been stopped for the duration of the sleep, correct for that.
     uint64_t rtc_ticks_at_end = rtc_time_get();
     uint64_t rtc_time_diff = rtc_time_slowclk_to_us(rtc_ticks_at_end - s_config.rtc_ticks_at_sleep_start, s_config.rtc_clk_cal_period);