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The logic for finding the name of the first in a series of variable names is somewhat convoluted and, in the use of .extend(), actively buggy. Document what is happening and simplify the logic. Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20250814154035.328769-4-corbet@lwn.net