Merge branch 'jk/zlib-inflate-fixes'

Merge branch 'jk/zlib-inflate-fixes'

Fix our use of zlib corner cases.

* jk/zlib-inflate-fixes:
  unpack_loose_rest(): rewrite return handling for clarity
  unpack_loose_rest(): simplify error handling
  unpack_loose_rest(): never clean up zstream
  unpack_loose_rest(): avoid numeric comparison of zlib status
  unpack_loose_header(): avoid numeric comparison of zlib status
  git_inflate(): skip zlib_post_call() sanity check on Z_NEED_DICT
  unpack_loose_header(): fix infinite loop on broken zlib input
  unpack_loose_header(): report headers without NUL as "bad"
  unpack_loose_header(): simplify next_out assignment
  loose_object_info(): BUG() on inflating content with unknown type