Update to pstree 2.20

Don't go into an infinite loop when encountering a zombie process on 5.x [1]

PR:		48852 [1]
Submitted by:	Joel Ray Holveck <joelh@piqnet.org> [1], fuyuki@mj.0038.net [1]

sysutils/pstree/Makefile

@@ -6,13 +6,15 @@
 #
 
 PORTNAME=	pstree
-PORTVERSION=	2.17
+PORTVERSION=	2.20
-CATEGORIES=    	sysutils
+CATEGORIES=	sysutils
-MASTER_SITES=	http://www.go.dlr.de/fresh/unix/src/misc/
+MASTER_SITES=	http://fresh.t-systems-sfr.com/unix/src/misc/
 
 MAINTAINER=	kris@FreeBSD.org
 COMMENT=	List processes as a tree
 
+NO_WRKSUBDIR=	yes
+
 do-build:
 	cd ${WRKDIR} && ${CC} ${CFLAGS} -o pstree pstree.c
 

sysutils/pstree/distinfo

@@ -1 +1 @@
-MD5 (pstree-2.17.tar.gz) = 15bac1ebc32c70e9eab803c028d04bb6
+MD5 (pstree-2.20.tar.gz) = df3deb4ac88841d3edb466272c7c1343

sysutils/pstree/files/patch-pstree.c

@@ -0,0 +1,14 @@
+--- pstree.c.orig
++++ pstree.c
+@@ -655,8 +655,9 @@
+   sprintf(nhead, "%s%s ", head,
+ 	  head[0] == '\0' ? "" : EXIST(P[idx].sister) ? C->bar : " ");
+   
+-  for (child = P[idx].child; EXIST(child); child = P[child].sister)
+-    PrintTree(child, nhead);
++  if (P[idx].pid)
++    for (child = P[idx].child; EXIST(child); child = P[child].sister)
++      PrintTree(child, nhead);
+ }
+ 
+ void Usage(void) {