Initializes a git_merge_file_input with default values. Equivalent to creating an instance with GIT_MERGE_FILE_INPUT_INIT.
git_merge_file_input
the git_merge_file_input instance to initialize.
the version of the struct; you should pass GIT_MERGE_FILE_INPUT_VERSION here.
GIT_MERGE_FILE_INPUT_VERSION
Zero on success; -1 on failure.