Output error diagnostics, if occurse.

Add radiolist test.

gnu/usr.bin/dialog/TESTS/checklist

@@ -28,5 +28,6 @@ case $retval in
   1)
     echo "Cancel pressed.";;
   255)
+    [ -z "$choice" ] || echo $choice ;
     echo "ESC pressed.";;
 esac

gnu/usr.bin/dialog/TESTS/inputbox

@@ -23,5 +23,6 @@ case $retval in
   1)
     echo "Cancel pressed.";;
   255)
+    [ -z "$input" ] || echo $input ;
     echo "ESC pressed.";;
 esac

gnu/usr.bin/dialog/TESTS/menubox

@@ -29,5 +29,6 @@ case $retval in
   1)
     echo "Cancel pressed.";;
   255)
+    [ -z "$choice" ] || echo $choice ;
     echo "ESC pressed.";;
 esac

gnu/usr.bin/dialog/TESTS/radiolist

@@ -0,0 +1,33 @@
+#!/bin/sh
+DIALOG=${DIALOG=/usr/bin/dialog}
+
+$DIALOG --title "RADIOLIST BOX" --clear \
+	--radiolist "Hi, this is a radiolist box. You can use this to \n\
+present a list of choices, one of them can be turned \n\
+on or off. If there are more items than can fit on the \n\
+screen, the list will be scrolled. You can use the \n\
+UP/DOWN arrow keys, the first letter of the choice as a \n\
+hot key, or the number keys 1-9 to choose an option. \n\
+Press SPACE to toggle an option on/off. \n\n\
+  Which of the following are fruits?" 20 61 5 \
+	"Apple"  "It's an apple." off \
+        "Dog"    "No, that's not my dog." ON \
+        "Orange" "Yeah, that's juicy." off \
+	"Cat"    "No, never put a dog and a cat together!" oFF  \
+	"Fish"   "Cats like fish." OFF \
+	"Lemon"  "You know how it tastes." oFF 2> /tmp/radiolist.tmp.$$
+
+retval=$?
+
+choice=`cat /tmp/radiolist.tmp.$$`
+rm -f /tmp/radiolist.tmp.$$
+
+case $retval in
+  0)
+    echo "'$choice' chosen.";;
+  1)
+    echo "Cancel pressed.";;
+  255)
+    [ -z "$choice" ] || echo $choice ;
+    echo "ESC pressed.";;
+esac