bdebstrap: do not reuse args variable name #242

Job	Run time
install (debian:bullseye-slim)	27s
unittest (debian:bullseye-slim)	30s
yamllint	11s
install (debian:bookworm-slim)	25s
unittest (debian:bookworm-slim)	29s
system-testing (debian:unstable-slim)	2m 42s
install (debian:testing-slim)	32s
unittest (debian:testing-slim)	35s
system-testing (ubuntu:jammy)	3m 32s
install (debian:unstable-slim)	28s
unittest (debian:unstable-slim)	44s
system-testing (ubuntu:mantic)	4m 3s
install (ubuntu:jammy)	23s
unittest (ubuntu:jammy)	51s
install (ubuntu:mantic)	33s
unittest (ubuntu:mantic)	34s
	16m 59s

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