Initializes a git_submodule_update_options with default values. Equivalent to
creating an instance with GIT_SUBMODULE_UPDATE_OPTIONS_INIT.
@param opts The git_submodule_update_options struct to initialize.
@param version The struct version; pass GIT_SUBMODULE_UPDATE_OPTIONS_VERSION.
@return Zero on success; -1 on failure.
Initialize git_submodule_update_options structure
Initializes a git_submodule_update_options with default values. Equivalent to creating an instance with GIT_SUBMODULE_UPDATE_OPTIONS_INIT.
@param opts The git_submodule_update_options struct to initialize. @param version The struct version; pass GIT_SUBMODULE_UPDATE_OPTIONS_VERSION. @return Zero on success; -1 on failure.