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71eed2520e
If the arguments to lzma_index_decoder() or lzma_index_buffer_decode() were such that LZMA_PROG_ERROR was returned, the lzma_index **i argument wasn't touched even though the API docs say that *i = NULL is done if an error occurs. This obviously won't be done even now if i == NULL but otherwise it is best to do it due to the wording in the API docs. In practice this matters very little: The problem can occur only if the functions are called with invalid arguments, that is, the calling application must already have a bug.