$NetBSD: patch-ab,v 1.2 2000/08/11 23:49:06 itojun Exp $
BSD curses: use strlen(s) on waddnstr(w, s, 0)
ncurses: print nothing on waddnstr(w, s, 0)
the code assumes ncurses behavior.  be explicit about the requirement.
--- screen.c-	Fri Aug 11 22:05:43 2000
+++ screen.c	Fri Aug 11 22:06:00 2000
@@ -118,3 +118,4 @@
 			i--;
-			waddnstr(w->wd, q, p - q);
+			if (p - q != 0)
+				waddnstr(w->wd, q, p - q);
 			wattrset(w->wd, COLOR_PAIR(*p));