Quick fix: check for NULL line in URL viewers.

ok jakob@

mail/pine/patches/patch-pine_mailview_c

@@ -0,0 +1,32 @@
+$OpenBSD: patch-pine_mailview_c,v 1.2 2004/08/10 23:47:05 tdeval Exp $
+--- pine/mailview.c.orig	Thu Jul 15 02:25:10 2004
++++ pine/mailview.c	Tue Aug 10 23:43:40 2004
+@@ -4306,6 +4306,9 @@
+     char	   buf[256], color[256];
+     HANDLE_S	  *h;
+ 
++    if (line == NULL)
++	return (-1);
++
+     for(lp = line; ; lp = up + n){
+ 	/* scan for all of them so we can choose the first */
+ 	if(F_ON(F_VIEW_SEL_URL,ps_global))
+@@ -4381,6 +4384,9 @@
+     static int     check_for_urls = 0;
+     register char *lp;
+ 
++    if (line == NULL)
++	return (-1);
++
+     if(isspace((unsigned char)*line))	/* continuation, check or not 
+ 					   depending on last line */
+       lp = line;
+@@ -4424,7 +4430,7 @@
+ {
+     register char *lp;
+ 
+-    if((lp = strchr(line, ':')) &&
++    if(line && (lp = strchr(line, ':')) &&
+        !strncmp(line, AB_COMMENT_STR, strlen(AB_COMMENT_STR)))
+       (void) url_hilite(linenum, lp + 1, ins, local);
+