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Fixed Case 4525: Possible enterCriticalRegion without exitCriticalRegion if a WST_MEM_Pool runs empty.

All C-language RXF releases using an RTOS.

Problem description:
If a MEM_Pool is out of memory we enter a critical region without exiting it. With an RTOS this causes taking a mutex which will not be freed again.

In the non-preemptive OO-RTX there is unusally no need to protect that region of WST_MEM_Pool_getMemory(). Future releases have support for a define WST_MEM_POOL_CRITICAL_REGIONS and will already contain corrected code for this issue.

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