Merge branch 'jk/sparse-leakfix'

Many memory leaks in the sparse-checkout code paths have been plugged. * jk/sparse-leakfix: sparse-checkout: free duplicate hashmap entries sparse-checkout: free string list after displaying sparse-checkout: free pattern list in sparse_checkout_list() sparse-checkout: free sparse_filename after use sparse-checkout: refactor temporary sparse_checkout_patterns sparse-checkout: always free "line" strbuf after reading input sparse-checkout: reuse --stdin buffer when reading patterns dir.c: always copy input to add_pattern() dir.c: free removed sparse-pattern hashmap entries sparse-checkout: clear patterns when init() sees existing sparse file dir.c: free strings in sparse cone pattern hashmaps sparse-checkout: pass string literals directly to add_pattern() sparse-checkout: free string list in write_cone_to_file()