style: Remove unused var

Author: Jan Krems

lib/node-inspect.js

@@ -33,8 +33,6 @@ const vm = require('vm');
 
 const debuglog = util.debuglog('inspect');
 
-const NO_FRAME = -1;
-
 const kOpCodeContinuation = 0x0;
 const kOpCodeText = 0x1;
 const kOpCodeBinary = 0x2;