NULL for return by reference values: error or ignore?

[Sebastian Huber]

Hello,

we have a couple of directives which set something and return the 
previous value, for example rtems_task_mode() and 
rtems_task_set_priority(). The value is returned through a pointer 
parameter. If this pointer is NULL, then the directives do nothing and 
just returns an error status. Why don't we simply not return a value in 
this case, so that you can set the task priority via 
rtems_task_set_priority(id, priority, NULL)?

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