[3.12] GH-89727: Fix FD leak on os.fwalk()
generator finalization. (GH-119766)
#119768
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Follow-up to 3c890b5. Ensure we
os.close()
open file descriptors whenthe
os.fwalk()
generator is finalized.(cherry picked from commit a5fef80)
Co-authored-by: Barney Gale [email protected]