tracetool: dtrace: handle in and next reserved words

Signed-off-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

scripts/tracetool

@@ -506,10 +506,12 @@ EOF
     i=1
     for arg in $arglist
     do
-        # 'limit' is a reserved keyword
-        if [ "$arg" = "limit" ]; then
-          arg="_limit"
-        fi
+        # postfix reserved words with '_'
+        case "$arg" in
+            limit|in|next|self)
+                arg="${arg}_"
+                ;;
+        esac
         cat <<EOF
   $arg = \$arg$i;
 EOF