Merge branch 'jk/leakfixes' into jk/sparse-leakfix

* jk/leakfixes: mv: replace src_dir with a strvec mv: factor out empty src_dir removal mv: move src_dir cleanup to end of cmd_mv() t-strvec: mark variable-arg helper with LAST_ARG_MUST_BE_NULL t-strvec: use va_end() to match va_start()