only perform the updates if the fetch succeeds

doc/draft/update

@@ -7,7 +7,8 @@ do
 	fi
 	pat=`echo "$i" | sed 's/...txt/??.txt/'`
 	old=`echo $pat 2> /dev/null`
-	fetch "http://www.ietf.org/internet-drafts/$i" 
+	if fetch "http://www.ietf.org/internet-drafts/$i" 
+	then
 		cvs add "$1" 
 		if test "X$old" != "X$pat"
 		then
@@ -17,4 +18,5 @@ do
 			old=
 		fi
 		cvs commit -m "new draft" $i $old
+	fi
 done