domain: fix off-by-one in Domain.exit()

We want to clear the found domain and the domains after it.

Signed-off-by: Trevor Norris <trev.norris@gmail.com>

lib/domain.js

@@ -141,7 +141,7 @@ Domain.prototype.exit = function() {
   // exit all domains until this one.
   var index = stack.lastIndexOf(this);
   if (index !== -1)
-    stack.splice(index + 1);
+    stack.splice(index);
   else
     stack.length = 0;
   _domain_flag[0] = stack.length;

test/simple/test-domain-enter-exit.js

@@ -0,0 +1,59 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+// Make sure the domain stack is a stack
+
+var assert = require('assert');
+var domain = require('domain');
+
+function names(array) {
+  return array.map(function(d) {
+    return d.name
+  }).join(', ');
+}
+
+var a = domain.create();
+a.name = 'a';
+var b = domain.create();
+b.name = 'b';
+var c = domain.create();
+c.name = 'c';
+
+a.enter(); // push
+assert.deepEqual(domain._stack, [a],
+                 'a not pushed: ' + names(domain._stack));
+
+b.enter(); // push
+assert.deepEqual(domain._stack, [a, b],
+                 'b not pushed: ' + names(domain._stack));
+
+c.enter(); // push
+assert.deepEqual(domain._stack, [a, b, c],
+                 'c not pushed: ' + names(domain._stack));
+
+b.exit(); // pop
+assert.deepEqual(domain._stack, [a],
+                 'b and c not popped: ' + names(domain._stack));
+
+b.enter(); // push
+assert.deepEqual(domain._stack, [a, b],
+                 'b not pushed: ' + names(domain._stack));