Xtt authorization error message fix

src/msg/rt/src/rt_xnav_msg.msg

@@ -72,5 +72,5 @@ waveformat	<Unsupported wavefile format>			/error
 filecorrupt	<File is corrupt>				/error
 notcollectw	<Not collect window>				/error
 noclassgraph	<No classgraph found>				/error
-
+notauthorized   <Not authorized for this operation>		/error
 

xtt/lib/xtt/src/xtt_xnav.cpp

@@ -1388,7 +1388,7 @@ int XNav::set_attr_value( char *value_str)
   if ( !((priv & pwr_mPrv_RtWrite) ||
          (priv & pwr_mPrv_System))) {
     message('E', "Not authorized for this operation");
-    return 0;
+    return XNAV__NOTAUTHORIZED;
   }
   brow_GetSelectedNodes( brow->ctx, &node_list, &node_count);
   if ( !node_count)