newlib: init microseconds offset
// Offset between FRC timer and the RTC.
// Initialized after reset or light sleep.
#if defined(CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER) && defined(CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER)
-uint64_t s_microseconds_offset;
+uint64_t s_microseconds_offset = 0;
#endif
#ifndef CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER
