@brief Find a set of GPIO lines by names among lines exposed by this chip. @param chip The GPIO chip object. @param names Array of pointers to C-strings containing the names of the lines to lookup. Must end with a NULL-pointer. @param bulk Line bulk object in which the located lines will be stored. @return 0 if all lines were located, -1 on error. @note If at least one line from the list could not be found among the lines exposed by this chip, the function sets errno to ENOENT.