always set sleeperState to Running when skipping sleep

When the custom logic of the IO-based sleep strategies returns
false we already have set the sleeper state to Sleeping and must
reset it.

emper/sleep_strategy/AbstractIoSleepStrategy.cpp

@@ -55,22 +55,24 @@ auto AbstractIoSleepStrategy::prepareSleep(const std::function<bool(void)>& cust
 	const SleeperState oldState = sleepState.exchange(SleeperState::Sleeping);
 	// Someone has notified us specifically -> skip sleeping.
 	if (oldState == SleeperState::Notified) {
-		sleepState.store(SleeperState::Running, std::memory_order_relaxed);
 		LOGD("State was notified -> reset notified state to running and skip sleeping");
-		return false;
+		goto skip;
 	}
 
-	// Me must have been running.
-	assert(oldState == SleeperState::Running);
+	// Me must have been running or already reading from the global IO object.
+	assert(oldState == SleeperState::Running || readingGlobal);
 
 	if (!readingGlobal) {
 		const bool shouldSleep = customLogic();
-		if (!shouldSleep) return false;
-
+		if (!shouldSleep) goto skip;
 		readingGlobal = true;
 	}
 
 	return true;
+
+skip:
+	sleepState.store(SleeperState::Running, std::memory_order_relaxed);
+	return false;
 }
 
 void AbstractIoSleepStrategy::submitAndWaitForCompletionsIn(IoContext& io) {