freertos: fix errors reported by PVS-Studio

Removed leftover code-paths that were never taken. Upstream freertos uses
vTaskSuspendAll() and xTaskResumeAll(), and therefor check if the task already
yielded.

In the IDF port of freertos we use critcal sections instead, so xAlreadyYielded
will never be set.

Partially addresses https://github.com/espressif/esp-idf/issues/6440

components/freertos/event_groups.c

@@ -198,7 +198,6 @@ EventBits_t xEventGroupSync( EventGroupHandle_t xEventGroup, const EventBits_t u
 {
 EventBits_t uxOriginalBitValue, uxReturn;
 EventGroup_t *pxEventBits = xEventGroup;
-BaseType_t xAlreadyYielded = pdFALSE;
 BaseType_t xTimeoutOccurred = pdFALSE;
 
 	configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
@@ -257,14 +256,7 @@ BaseType_t xTimeoutOccurred = pdFALSE;
 
 	if( xTicksToWait != ( TickType_t ) 0 )
 	{
-		if( xAlreadyYielded == pdFALSE )
-		{
-			portYIELD_WITHIN_API();
-		}
-		else
-		{
-			mtCOVERAGE_TEST_MARKER();
-		}
+		portYIELD_WITHIN_API();
 
 		/* The task blocked to wait for its required bits to be set - at this
 		point either the required bits were set or the block time expired.  If

components/freertos/tasks.c

@@ -1406,7 +1406,7 @@ static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB, TaskFunction_t pxTaskCode
 	void vTaskDelayUntil( TickType_t * const pxPreviousWakeTime, const TickType_t xTimeIncrement )
 	{
 	TickType_t xTimeToWake;
-	BaseType_t xAlreadyYielded = pdFALSE, xShouldDelay = pdFALSE;
+	BaseType_t xShouldDelay = pdFALSE;
 
 		configASSERT( pxPreviousWakeTime );
 		configASSERT( ( xTimeIncrement > 0U ) );
@@ -1470,16 +1470,8 @@ static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB, TaskFunction_t pxTaskCode
 		}
 		taskEXIT_CRITICAL( &xTaskQueueMutex );
 
-		/* Force a reschedule if xTaskResumeAll has not already done so, we may
-		have put ourselves to sleep. */
-		if( xAlreadyYielded == pdFALSE )
-		{
-			portYIELD_WITHIN_API();
-		}
-		else
-		{
-			mtCOVERAGE_TEST_MARKER();
-		}
+		/* Force a reschedule, we may have put ourselves to sleep. */
+		portYIELD_WITHIN_API();
 	}
 
 #endif /* INCLUDE_vTaskDelayUntil */
@@ -1489,8 +1481,6 @@ static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB, TaskFunction_t pxTaskCode
 
 	void vTaskDelay( const TickType_t xTicksToDelay )
 	{
-	BaseType_t xAlreadyYielded = pdFALSE;
-
 		/* A delay time of zero just forces a reschedule. */
 		if( xTicksToDelay > ( TickType_t ) 0U )
 		{
@@ -1515,18 +1505,11 @@ static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB, TaskFunction_t pxTaskCode
 			mtCOVERAGE_TEST_MARKER();
 		}
 
-		/* Force a reschedule if xTaskResumeAll has not already done so, we may
-		have put ourselves to sleep. */
-		if( xAlreadyYielded == pdFALSE )
-		{
-			portYIELD_WITHIN_API();
-		}
-		else
-		{
-			mtCOVERAGE_TEST_MARKER();
-		}
+		/* Force a reschedule, we may have put ourselves to sleep. */
+		portYIELD_WITHIN_API();
 	}
 
+
 #endif /* INCLUDE_vTaskDelay */
 /*-----------------------------------------------------------*/