Writing to a struct passed by value is pointless. Remove dead code.
Writing to a struct passed by value is pointless. Remove dead code.

- free(NULL) is a nop anyway.
- if someone thinks calling clang_disposeString twice should be legal
  please change the method to take a pointer.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@86568 91177308-0d34-0410-b5e6-96231b3b80d8

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