fix fiq_debugger-set-uart-irq-no-balancing

hc

2024-07-02 39af2116d7581c9a12be9e73bb6bdc31496495ef

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# Taken from smmap/test/test_tutorial.py
 
import smmap
mman = smmap.SlidingWindowMapManager()
assert mman.num_file_handles() == 0
assert mman.mapped_memory_size() == 0