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()

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