Added yet another type cast to the else if clause in xTaskCheckForTimeOut.  This is to ensure it works correctly on ALL 16 bit compilers (hopefully).
Added yet another type cast to the else if clause in xTaskCheckForTimeOut.  This is to ensure it works correctly on ALL 16 bit compilers (hopefully).

FreeRTOS/FreeRTOS-Kernel,FreeRTOS/FreeRTOS-Kernel