Some newsgroups seems to have a ' in their name, thus
tokenize(..) is not appropriate.

Reference: /n/sources/patch/applied/nntpfs-groups
Date: Mon Nov 15 14:15:20 CET 2004

--- /sys/src/cmd/nntpfs.c	Mon Nov 15 14:15:20 2004
+++ /sys/src/cmd/nntpfs.c	Mon Nov 15 14:15:20 2004
@@ -541,7 +541,8 @@
 	while(p = Nrdline(n)){
 		if(strcmp(p, ".")==0)
 			break;
-		nf = tokenize(p, f, nelem(f));
+
+		nf = getfields(p, f, nelem(f),1,"\t\r\n ");
 		if(nf != 4){
 			int i;
 			for(i=0; i<nf; i++)