95     for ((dp) = (tp)->tp_first_diff; (dp) != NULL; (dp) = (dp)->df_next)
326     dp = tp->tp_first_diff;  in diff_mark_adjust_tp()
499     dp = tp->tp_first_diff;  in diff_mark_adjust_tp()
512 		tp->tp_first_diff = dnext;  in diff_mark_adjust_tp()
550 	    tp->tp_first_diff = dnew;  in diff_alloc_new()
939     int		had_diffs = curtab->tp_first_diff != NULL;  in ex_diffupdate()
983     if (had_diffs || curtab->tp_first_diff != NULL)  in ex_diffupdate()
1615     diff_T	*dp = curtab->tp_first_diff;  in diff_read()
1847     for (p = tp->tp_first_diff; p != NULL; p = next_p)  in diff_clear()
1852     tp->tp_first_diff = NULL;  in diff_clear()
1877     if (curtab->tp_first_diff == NULL || !wp->w_p_diff)	// no diffs at all  in diff_check()
2548     if (curtab->tp_first_diff == NULL)  in diff_infold()
2740     for (dp = curtab->tp_first_diff; dp != NULL; )  in ex_diffgetput()
2848 			curtab->tp_first_diff = dp;  in ex_diffgetput()
2974     if (idx == DB_COUNT || curtab->tp_first_diff == NULL)  in diff_move_to()
2980     if (curtab->tp_first_diff == NULL)		// no diffs today  in diff_move_to()
2986 	if (dir == BACKWARD && lnum <= curtab->tp_first_diff->df_lnum[idx])  in diff_move_to()
2989 	for (dp = curtab->tp_first_diff; ; dp = dp->df_next)  in diff_move_to()
3035     if (idx1 == DB_COUNT || idx2 == DB_COUNT || curtab->tp_first_diff == NULL)  in diff_get_corresponding_line_int()
3041     if (curtab->tp_first_diff == NULL)		// no diffs today  in diff_get_corresponding_line_int()