RTEMS | bsp/stm32h7: fix DMA allocator IRQ handling and stream boundary check (!1196)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on bsps/arm/stm32h7/dma/dma-allocator.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1196#note_151966

 >    index += dma_channel_offset / dma_channel_size;
 >    dma_mask = 1 << index;
 >  
 > +  if (ctx->irq_installed) {

If an application is attempting to free a DMA channel that it does not own, that is an application bug and should not be ignored.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1196#note_151966
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