child_process: do not set args before throwing

No point in setting args and options if TypeError
is being thrown.

fix #7456

Signed-off-by: Fedor Indutny <fedor@indutny.com>

lib/child_process.js

@@ -711,8 +711,6 @@ var spawn = exports.spawn = function(file /*, args, options*/) {
     args = arguments[1].slice(0);
     options = arguments[2];
   } else if (arguments[1] && !Array.isArray(arguments[1])) {
-    args = [];
-    options = arguments[2];
     throw new TypeError('Incorrect value of args option');
   } else {
     args = [];